Botanists and gardeners run guided tours, and at nightfall visitors can watch an elaborate firework display over the Italian garden.

BBC: Green-fingered gatherings in Berlin

It opened to visitors in 2009 and part-guided tours allow you to wander between rooms where the furnishings and knick-knacks are much as she left them.

BBC: Mini guide to coastal Devon

The former home of the Bishops of Durham now has guided tours, a children's trail for younger visitors, a new tearoom and an exhibition of religious artwork.

BBC: Auckland Castle reopens after redevelopment

Carlson is arranging guided tours for visitors to Kodak's medical-imaging facility in the Olympic Village and the press center (where Kodak will process 5 million digital images), along with tickets to carefully selected Olympic events and perks like visits to the Great Wall and trips to Beijing's Silk Market.

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