Trafalgar Square wasn't supposed to exist. The original plan called for a statue of William IV on horseback, nothing more. But when Parliament baulked at the cost, they built a square instead, complete with fountains designed to keep revolutionary mobs from gathering. The fountains failed spectacularly at crowd control: the square has hosted everything from suffragette rallies to anti-apartheid vigils.

Nelson's Column shoots up 169 feet from the centre, though the admiral himself stands just five feet four inches tall up there. The bronze lions at its base, cast from French cannons, weren't added until 1867, nearly a quarter-century after the column went up. Edwin Landseer, better known for painting dogs, had never actually seen a lion, which might explain their peculiar paws.

VoiceMap's self-guided audio tours reveal the square's role as London's stage for protest and celebration, explaining why the fourth plinth stays empty, tracing the secret tunnels beneath the fountains, and uncovering the Admiralty's underground citadel that still monitors these streets.