1. Liberty Bell

Invented and designed by a San Francisco mechanic named Charles Fey in 1895, the Liberty Bell is the first slot machine. The main symbols here include horseshoes, stars, spades, diamonds, hearts, and Liberty Bells. Once three bells are aligned, the machine pays 50 cents.
Having a coin slot at the top, it features small reels in the middle and a paytable at the bottom. It works like this - players insert a Nickel and pull a lever on the right-hand side to spin the reels. Although the Operator Bell and Liberty Bell have been removed from casinos, the original Liberty Bell on display can be seen in the Liberty Belle saloon in Reno, Nevada.

2. Lion's Share

One of the most famous slot machines, Microgaming’s classic slot Lion's Share, gained a lot of success back in 2014, due to news channels that discussed the topic on how Lion's Share's progressive jackpot hasn’t been hit for two decades. Thousands of people have tried but no one was lucky enough to pull it off.
Although the machine only featured 3 reels and only 1 payline, Lion’s Share has managed to become one of the most popular releases in Vegas, so popular that people waited in line just to put a coin into it and try spinning those reels.
Eventually, a New Hampshire couple hit the $2.4 million progressive jackpot in MGM’s Grand’s Lion’s Share. Soon after, MGM Grand made a decision to retire the Lion's Share machine since it required a lot of maintenance. Still, the game became part of slot history with a jackpot that took 20 years to win.

3. Megabucks

Created by IGT, Megabucks has managed to become one of the world's best progressive slot machines. The game is also responsible for numerous big wins throughout the entire jackpots’ history. Also known as the biggest money jackpots of all time, Megabucks slot machines are described as simple games with a massive progressive jackpot. One of the biggest wins was when an anonymous engineer won a staggering $39.7 million at Las Vegas' Excalibur, back in 2003.
As for the other big wins hit on this machine, there was a cocktail waitress Cynthia Jay Brennan who snagged an incredible $34.9 million at Vegas' Desert Inn, as well as a retired flight attendant hitting $27.5 million at Vegas' Palace Statio­n. J­ohanna Huendl won $22.6 million whereas an Illinois businessman hit $21.3 million on the very first spin.
However, after winning the prize, one of the winner's family members had a tragic accident, which (as some believe) only supported the theory of a Megabucks curse. Other unfortunate stories are just believed to be urban legends, including anecdotes about underage players, as well as casino employees, being big winners but not being able to claim their jackpots because of specific state laws and regulation.

4. Wheel of Fortune

IGT’s Wheel of Fortune has proven to be the second most famous slot machine of all time. Featuring a bonus feature just like the real show, the slot machine is usually played by many slot fans and can be found in numerous casinos all over the globe. Although the game comes in more variations, probably the most popular one is still its 3-reel version, with a colourful wheel at the top.
The Wheel of Fortune multiplayer game features a bank of machines where every player gets their own screen. What makes the game even more exciting is the multiplayer edition where people can play the bonus round together, which really intensifies the game show aspect.
In a 5-reel Wheel of Fortune slot, however, Wild symbols will help players land winning combos and, if you’re lucky enough, you may get a Super Wild that will boost your win up to 5x! Last but not least, the Triple Action Bonus is activated by getting at least 3 Triple Action Bonus symbols anywhere on the reels. But still, none of the newer Wheel of Fortune slots measure up to the original one because of the large progressive jackpot involved.
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5. Mega Fortune

Featuring 5 reels and 25 paylines, NetEnt’s Mega Fortune slot became very popular among players as it usually grows into a multimillion-euro amount before being hit. The main symbols here include luxury cars, yachts, and expensive jewellery, Mega Fortune is an online slot machine game which justifies its theme that comes with the largest ever online slot jackpots.
The game offers a few different features that make the entire gameplay more fascinating, however, by far the most interesting ones are the 3 different progressive jackpots: Mega Jackpot, Major Jackpot and Rapid Jackpot. There are counters for all 3 of these that are displayed above the reels. Champagne is the Scatter and if you land at least 3 of them simultaneously, you will trigger Free Spins bonus round. Likewise, Wheel of Luck is the Bonus symbol, and if you land 3 or more symbols in succession from left to right on an active payline, you will activate the Bonus game.
What’s interesting about this slot is the fact that a Finnish man won a huge jackpot worth €17.8 million while spinning the reels of Mega Fortune. This record from 2013, has been passed by Mega Moolah, but the game is still proof how rich players can get after playing Mega Fortune.
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6. Mega Moolah

Powered by Microgaming and being among most popular slot games, Mega Moolah is a 25-payline progressive slot which has served as a competitor to Mega Fortune's big jackpots. Followed by African safari music, the game features antelopes, elephants, giraffes, lions, monkeys and zebras as the main symbols.
Landing at least 3 Scatters at the same time will trigger 15 Free Spins. What’s more, all wins hit during Free Spins are tripled, whereas Free Spins can also be retriggered. Players can win one of the 4 Progressive Jackpots within the randomly triggered Bonus round.
The game paid some of the largest slot machine jackpots that have ever been triggered. In 2015,for example, Mega Moolah gained international recognition when a British soldier Jon Heywood won a massive €17,879,645.
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7. Cleopatra

Inspired by the famous Egyptian theme and Developed by IGT, Cleopatra is a 20-payline classic game that managed to stand out above similar releases. Featuring ancient Egyptian music, the main symbols here include Cleopatra, the Eye of Horus, scarabs, and pyramids. Landing at least 3 Sphinx symbols will trigger the Cleopatra Bonus, which awards 15 Free Spins. All prizes, except for the 5 Cleopatra symbols, are tripled in the Free Spins round.
The game has been so successful that it inspired its creators to make a sequel, Cleopatra II, with richer graphics and engaging sound effects. But even if you choose the original game, you'll be playing a classic that's still enjoyed by various players today. And, in case you land 5 Cleopatra symbols you’ll get a jackpot of 10,000 coins.

8. Book of Ra

Having a popular Ancient-Egypt theme, Book of Ra has always been one of the best choices to play in land based and online casinos. Powered by Novomatic, Book of Ra is a 9 payline video slot that offers plenty of bonus features and big payouts. With entertaining narrative and energising gameplay, there are numerous ways to win here.
In case you land 5 archaeologists simultaneously, you’ll get an impressive 5,000x your line bet. Earning big bucks, however, comes from the Free Spins feature. What players need to do is land at least 3 Scatter books to trigger the Free Spins feature. Pages of the book will flip and randomly determine which symbol will expand during the 10 Free Spins.
Although hitting the jackpot may not be easy, with only a few one in between, when big wins come, they can be big.

9. Starburst

There’s no denying NetEnt’s Starburst slot became kinda legendary in the iGaming universe. With its dark background and shiny space looking gemstones, Starburst slot features 5 reels and 10 paylines. The well-known futuristic music in this release is also easily noticeable, as is the game’s expanding Wild.
More precisely, the Wilds may only occur on the reels 2, 3 and 4, and, once 1 or more wilds appear on those reels, the Starburst Wild feature will be activated. During this feature, Starburst wilds expand to cover the entire reel and remain while the other reels re-spin. Should a new wild land during a re-spin, it expands and stays along with any previously expanded Starbursts for another re-spin.
Another cool feature is that Starburst pays both ways, instead of only paying you for landing at least 3 identical symbols on adjacent reels starting with the reel furthest to the left. The maximum single spin payout for a person (betting the $200 maximum) is $100,000. But, in order for that to happen, you must land five bars on consecutive reels on an active payline. Players love this slot, probably because it’s suitable for both newbies and experienced players.

10. Immortal Romance

Powered by Microgaming, Immortal Romance is based on sci-fi and the cult of Vampires which has become one of the popular casino slot machines in the last couple of years. Apart from superb graphics and great audio and visual effects, the slot features 5 reels and 243 paylines, and the theoretical RTP rate of 96.86%. The four main characters are Amber, Troy, Michael and Sarah.
When it comes to features and bonus games, Immortal Romance offers different variants. Wild Desire feature can occur randomly, and as soon as it does, it can turn 1 to 5 reels completely Wild. Likewise, landing 3 or more Scatters anywhere on the reels in this game, activates the Chamber of Spins feature which cannot be triggered during Wild Desire.
The game is still among the most popular slots, as many players still try their luck in this slot in the hope to get the highest multiplier possible.

11. Gonzo’s Quest

Beautifully designed video slot powered by NetEnt, Gonzo Quest features 5 reels and 20 paylines. The story is based on the famous conquistador Gonzalo Pizzaro who is on his way to the Peruvian ruins and just about to experience the unique quest.
Now, Gonzo’s Quest has become one of the most popular slot games of all time, probably because it comes with a few interesting features, Avalanche Multipliers feature being the most interesting one of all. In Essence, the reels in the slot move in a cascading manner which resemble an Avalanche. As you activate each new Avalanche, you will win a multiplier. Multipliers are displayed above the reels, and go up to 5x, that is if you land 4 or more avalanches simultaneously.

12. Age of the Gods

Being among famous slot machines and inspired by Ancient Greek mythology, Age of the Gods is a 5-reel, 20-payline progressive slot powered by Playtech. The main characters are Athena, Zeus, Hercules, and Poseidon power up 4 free game modes that offer extra wilds and win multipliers! Once you start spinning, you’ll come across a series of bonus features, such as Athena Free Games, Zeus Free Games, Poseidon Free Games and Hercules Free Games.
Wild logo is the game’s wild card and it substitutes for all symbols, with the exception of the Scatter. Landing at least 3 Scatters anywhere on the reels simultaneously triggers the Bonus game. Moreover, landing 5 God symbols in any order on an active payline will get you 200x your line bet!
During the main game, any spin can activate the Age of the Gods Mystery Jackpot. This mini game guarantees a win of up to 4 progressive jackpots. All you gotta do is click on the coins to reveal jackpot symbols, and if you match 3 identical ones, you will win that jackpot.

13. Money Honey

Having a cute theme, Money Honey is a 5-reel and a 243 payline slot themed around honey. With Wilds, Free Spins, Scatters and multipliers, it is a fast-paced exciting creation featuring vibrant colours. Likewise, it is a mobile-optimized slot which may be an excellent choice if you’re new to online gambling or if you’ve been playing for years.
Just like in other games, Wilds will help you win payouts as they are able to replicate most other symbols on the reels once a winning combination has been made. Another symbol you may want to keep your eyes on is a Money Wheel card. Once you manage to land at least 3 of them on your reels after a spin, the bonus game begins, and you spin a big wheel to choose a prize.

14. Quick Hit

And our selection wouldn’t be complete without Bally's Quick Hit slot. Featuring traditional Las Vegas symbols with sharp graphics and relaxed music, the video slot has 5 reels, 3 rows, and 30 paylines. Once you decide how many paylines you want to bet on, your gaming adventure can begin. There are Scatters symbols and three bonus games to benefit from.
The biggest payout here comes from landing the triple seven symbol. Should you land 5 of these lucky numbers on the reels at the same time, you will win 5,000 coins, whereas if you land five wild symbols, you’ll get 12,500 coins.
Those looking for hitting a jackpot should pay attention to Quick Hit Platinum symbols as 5 of these contribute to 5,000x players’ original bet amount – and even more, with the max bet activated. The second-highest jackpot can be hit by landing 9 Quick Hit Slot symbols. Both the Quick Hit Platinum and regular Quick Hit symbols must occur on or within one position of the first payline to be eligible for a jackpot win.

15. SlotZilla Zip Line

And now something completely different. We’re finishing our selection of famous slots in style, with the world’s largest slot machine - StotZilla Zip Line - 128 feet tall which has two take-off levels. This $12 million SlotZilla zip line took more than a year to build and opened its doors in 2014 and has already had more than 2 million riders so far.
The 11-story slot machine is decorated with over-sized dice, a glass of martini, a pink flamingo, video reels, coins, and two showgirls - Jennifer and Porsha. SlotZilla offers two different rider experiences - the upper Zoomline and a lower Zipline. This unique machine has a huge video screen with reels and a gigantic arm, replicating a true slot machine experience.