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.
Dr William Marino
Reference
Casino At Marino Dublin
http://www.heritageisland.com/attractions/casino-marino/
Mar 31, 2017 The original house is long gone, but both the Casino and the remaining portions of the garden which surround it give some idea of the grandeur that once existed here. At one time the Casino would have been the focal point of a long view down the park from the reception rooms of.
https://www.irishtimes.com/culture/heritage/casino-at-marino-public-s-first-view-of-secret-test-fire-tunnels-1.2760775
http://www.thejournal.ie/tunnel-vision-going-underground-at-the-casino-marino-565372-Aug2012/