Gaming has roots that trace back to mankind's earliest ancestors. However, it wasn't until the world's very first casino, known as Il Ridotto (Italian: Private Room ), opened its doors in Venice, Italy, that gaming went from small rooms and backlots to a more organized fashion.
1600 The first casino is invented in Italy. 1800 Gambling houses became more common in Europe and appeared in the US. 1850 The first known slot machine was invented around 1850.