Beneath the streets lies a different world. The London Transport Museum in Covent Garden is surprisingly fun for adults—ride a vintage Tube carriage and smell 150 years of history in the upholstery. Yes, it’s a thing.
For something truly offbeat, book a tour of the Postman’s Park (it’s indoors in spirit, though the garden is sheltered by trees). Look for the wall of commemorative plaques honouring ordinary people who died saving others—it’s heartbreaking and hopeful.
Need a drink? Gordon’s Wine Bar near Embankment is a cellar from the 1890s, lit by candlelight. It’s cramped, sticky-floored, and perfect for a glass of port while pretending you’re a Victorian spy.