The immense amount of cash flowing through casinos naturally attracts the world's most ambitious criminals.

Today, surveillance systems are flawless, but in the past, clever thieves managed to walk away millions.

Bill Brennan and the Stardust Robbery

Bill Brennan, a trusted sports book cashier, pulled off a flawlessly simple inside job.

During his lunch break, he casually strolled out of the casino with $500,000 in cash and chips.

• Occurred at the Stardust Casino in 1992
• The thief was a trusted employee
• He disappeared without a single trace

The Edge Sorting Controversy

While not a traditional robbery at gunpoint, Phil Ivey's baccarat session cost casinos millions.

Ivey and his partner won nearly $20 million from casinos in London and Atlantic City.

The Ocean's Eleven Style Heist

The hacker used the surveillance cameras to look at the dealer's cards during VIP games.

Information was then secretly relayed to the player at the table via a wireless earpiece.

These incredible stories remind us that casinos are engaged in a constant arms race with clever criminals.