Preserved behind glass, the ruins of a medieval building used to store human remains.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

A masterpiece of Art Deco architecture hidden in plain sight in West London.

The medieval woodcut-style artwork chronicles life in medieval London.

The pockmarks across the building's facade are remnants of the Blitz.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The commemorative stone column conceals a secret laboratory.

A measuring mishap led to these artificial stone ladies losing their stomachs.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

Ship-sized kinetic sculptural fantasy.

Charles Babbage's proto-computer, painstakingly brought to life.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Pop culture has helped to keep this iconic British building from being destroyed.

This secluded walkway overlooks a magnificently wild London green space.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A hands-off space for graffiti artists to hone and display their skills.

One part local history, 99 parts gruesome haunted house.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.