St Martin-in-the-Fields Church | London

You'll descend stone steps into one of London's most atmospheric dining spaces, where vaulted ceilings and candlelit tables create an almost medieval feel right beneath Trafalgar Square's bustle. The café occupies the actual crypt of this 18th-century church, and the setting alone makes your soup and sandwich taste infinitely better than it would anywhere else. The menu keeps things simple with decent salads, warming soups, and proper cakes that fuel the steady stream of tourists, office workers, and concert-goers who've discovered this subterranean spot. It's particularly brilliant before or after one of the church's famous evening concerts upstairs. Yes, you're essentially eating surrounded by centuries of London history, but the atmosphere never feels forced or touristy—just genuinely unique.