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St. Paul's dome, St. Paul's Cathedral.
For the fit or ambitious, you can climb 530 steps to the Golden Gallery, an observation platform atop the dome of the cathedral. From there you can look out over the modern skyline of the city of London.

On the way, the climb leads through the Whispering Gallery; a circular walkway halfway ups the inside of the dome. Due to the acoustics of the curved surface, a phrase whispered against one wall can be heard against the far wall 112 feet away.