The Monument was built in 1671-77 to commemorate the Great Fire of London in 1666.
If you want to climb to the top it will cost a few pounds, but at the top of the 311 steps you will be rewarded with a panorama of London and a certificate to show that you made it.
UG: Monument 0.05km
OG&UG: London Cannon Street 0.34km
UG: Bank 0.42km
Apr-Sep 9.30am-6pm, Oct-Mar 9.30am-5.30pm.
Always check details regarding opening hours, accessibility and pricing before travelling.