It's 311 steps (212ft) to the top of this Doric column, specially built to commemorate the Great Fire Of London by Sir Christopher Wren, but it's worth the effort. Once there, you'll have a spectacular panoramic view over the capital. To prove you toiled your way to the top, they even hand you a certificate. 9.30am-5pm. The Monument, Monument Street, EC2 (020-7626 2717). £1.50, under-16s 50p.