This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

A mysterious shape catches the eye in this 16th-century painting.

The bronze uniforms commemorate the vital role of women during World War II.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

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

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

Putting the "mod" in "modular" since 2000.

The commemorative stone column conceals a secret laboratory.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

An architectural oddity hides in plain sight on this iconic London bridge.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The ritual has been performed uninterrupted for nearly 700 years.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.