Castlereagh and Mount Stewart
Most Regency fans will recognise the famous portrait of Lord Castlereagh, the British Foreign Secretary from 1812, and Britain's representative at the Congress of Vienna in 1814-1815.
Sadly, the splendid garden is modern, created in the 20th century, and much of the house celebrates the lives of the 20th century family. But you can see how magnificent the interior was. Here, for example, is the marble hall with the galleried landing above.
Some copies of Castlereagh memorabilia are still on view, including paintings, etchings and papers, as well as busts and miniatures. Perhaps most interesting are these chairs. There are 22 of them and they were used at the Congress of Vienna. They were later presented to Castlereagh's half-brother (the 3rd Marquess of Londonderry) as a tribute to the diplomatic achievements of both brothers.