A French library that makes sure its love of books is writ large... giant in fact.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This garden houses the remains of the ancient Greek port of Marseille.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This hidden garden boasts amazing views of Lyon.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

Eighty million natural history specimens call this gargantuan museum home.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

In paradise, feral pigs have claimed an island all to themselves.

Small church built in the 19th century for whites and slaves to worship together.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This tiny home was originally a narrow alleyway.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

This bridge over the River Cuale leads to a neighborhood that was once an escape for Hollywood's elite.