The Grade A-listed building is Scotland's answer to 10 Downing Street and the venue for cabinet meetings.
It has entertained the rich, famous and powerful, including Sir Sean Connery and Lady Connery, Sir Tom Farmer and Sir Brian Souter. After the property was built in 1806, it changed ownership several times before the 4th Marquess of Bute took it on.
It is owned by the National Trust for Scotland and leased to the Government.
From 1970, it became the official residence in Edinburgh of the Secretary of State for Scotland.