The Casino is located at Marino, next to the Malahide Road. It was designed by Sir William Chambers as a pleasure house for James Caulfield, 1st Earl of Charlemont. It is an example of 18th century neo-classical design. The Casino, meaning “small house”, contains a total of 16 finely decorated rooms.
There are a series of tunnels which seem to have been built to connect Marino House with the Casino – but it’s likely that Charlemont ran out of money. These unfinished tunnels were later used by Michael Collins and other revolutionary leaders during the War of Independence to test-fire sub-machine guns.