Amsterdam's former hotspot for public executions and dissections.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

Mysterious Incan ruins on a tiny island in Lake Titicaca.

An ancient Incan convent on Lake Titicaca's Island of the Moon.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

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

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

The final resting place of a German diplomat's beloved companion.

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

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

London's smallest police station is barely the size of a phone booth.

This coffee shop lies hidden beneath a historic church.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A living memorial to the trees London lost during the Great Storm of 1987.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.