Adam heads into the City of London and then goes down, well below the modern pavements, to investigate the capital's Roman past at the London Mithraeum Bloomberg SPACE.
Underneath the building is the temple of Mithras, put up by Roman Londoners around 1,800 years ago and dug up again in the 1950s. It has been rebuilt on the spot where it was found, and it is brought to life with light, haze and sound so you get a sense of what it might have felt like to step inside all those centuries ago... Upstairs there is a wall of objects pulled out of the ground when the site was excavated, and a changing contemporary art commission that responds to the history underneath.
Best of all, it is completely free to visit, although it is worth booking a slot before you go. It is open Tuesday to Saturday and on Sunday afternoons, and closed on Mondays.
Find out more by searching for London Mithraeum.

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