Located beneath Guildhall’s Great Hall is the oldest surviving part of the structure, the largest of London’s medieval crypts.

Dating from the reign of King Edward the Confessor in the 11th century, the vaulted East Crypt is considered to be one of the finest examples of its kind in England with a ceiling featuring a series of carved bosses depicting heads, shields and flowers.

It features a series of stained glass windows depicting five famous Londoners – Geoffrey Chaucer, William Caxton, Sir Thomas More, Sir Christopher Wren and Samuel Pepys.

The pillars holding up the roof, meanwhile – once located at ground level – show signs of where horses were once tied up while their riders went about their business.

The West Crypt, which is believed to date from the 13th century, was sealed off after collapsing under the weight of the roof of the Great Hall which fell down during the Great Fire of London in 1666. It was reopened in 1973.

The windows of the West Crypt represent some of the City of London’s livery companies (pictured above, right).

One of the most famous incidents took place in the crypts on 9th July, 1851, when Queen Victoria attended a banquet here during a state visit.

The crypts today are available to hire for atmospheric events.

WHERE: Guildhall, Guildhall Yard, City of London (nearest Tube stations are Bank, Mansion House and Moorgate); WHEN: 10am to 4.30pm daily (when not being used for events); COST: Free; WEBSITE: www.cityoflondon.gov.uk/things-to-do/visit-the-city/attractions/guildhall-galleries/Pages/guildhall.aspx.