Ranelagh
a building erected in 1742 on the site of the gardens of a villa of the last Earl of Ranelagh Chelsea, London, England. Its rotunda was 150 feet in diameter, with an orchestra in the center and tiers of boxes all round.
The chief amusement, promenading, as it was called, was going round and round the area below, and taking refreshments in the boxes, the orchestra performing meanwhile. Ranelagh was a fashionable and notorious place of resort in 1740- 1803. Its last public appearance was when the installation ball of the Knights of the Bath was given there in 1802.
This building was closed the next year and torn down. Its site is now part of the Chelsea Hospital garden.