Catacombs turned marketplace.

The world's first purpose-built motor racetrack was destroyed by the outbreak of two world wars.

Abandoned waterpark turned counter-culture mecca.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

The London statue that imitates passersby.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

The oldest working mechanical clock in the world.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

Seat of the Duke and Duchess of Devonshire for centuries.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

One of the oldest trees in Britain may have been witness to some of the country's formative moments.

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This automated sculpture of two men peeing will spell out text messages with their micturition.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

The anatomical-pathological collection of a man who changed surgery.

The Tudor-style cottage in the middle of the square is not quite what it seems.