Sir Christopher Wren’s 300-year-old cathedral has stunning mosaics. Climb up the dome to the Whispering Gallery and a further 271 steps to the Golden Gallery for a classic London panorama. Then head down to the crypt, with its monuments to Wren and Lord Nelson. The current Great Restoration of the 1920s exhibition details the little-known story of the project to save the dome, after the cathedral was served a Dangerous Structures notice in 1924. The price of admission also includes a multimedia guide and tours, subject to availability on the day. Mon-Sat 8.30am-4.30pm. Adult £20; child £8.50.