The house at Stowe, home in the 18th century to the Temple family and its head Viscount Cobham, is now an exclusive public school. The grounds, which were laid out by Charles Bridgeman, William Kent and Lancelot "Capability" Brown, are in the hands of the National Trust. There are miles of walks with temples, statues and stunning vistas.
Karin waiting patiently by the steps of the Queen's Temple. It was where Lady Cobham would entertain her lady friends and is now used by the school as a music room.
The Temple of Venus
The Temple of British Worthies - still a good place for a group portrait.
View from the Grotto, recently reopened after extensive restoration
And here's a Wikipedia article about the park and gardens