This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

One of three sites in England that house the National Collection of Arms and Armour.

The final resting place of England's most notorious bandit.

The little-known second castle that William the Conqueror built in York.

After public executions took place at this location, attendants would also attend a local horse race.

When the plague struck York, this stone was used to leave supplies for the sick.

Cycle the solar system—from the sun to Pluto—right here on earth.

England's largest white horse isn't even white.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.

The last fully working Victorian Turkish bath in England.

A tiny church on a man-made island in the Adriatic.

Gargoyle head that brings good luck.

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

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.