Mrs Macquarie’s Chair is an exposed sandstone rock cut into the shape of a bench, on a peninsula in Sydney Harbour. It was hand carved by convicts in 1810, for Elizabeth Macquarie, the wife of Major-General Lachlan Macquarie, Governor of New South Wales. The peninsula itself was known to the Gadigal as Yurong Point, and is now widely known as Mrs Macquarie’s Point, and is part of The Domain, near the Royal Botanic Gardens.

More details: https://en.wikipedia.org/wiki/Mrs_Macquarie%27s_Chair