The London statue that imitates passersby.

A collection of machines designed to break things for science.

A recreation of a sign that Charles Dickens used to see on his walk home.

A network of concealed passageways lies within a busy London Underground station.

To the famous surrealist artist, liberty required two torches held high.

This imposing castle has stood for nearly a thousand years.

This old, abandoned hotel offers magnificent views.

Get a close-up look at a 16th-century Basque whaling ship at this factory and museum.

A young Gustave Eiffel assisted in the construction of this skinny metal observation tower.

The wreck of a World War II cargo ship has become an unintentional time capsule at the bottom of the Red Sea.

Hundreds of preserved dinosaur footprints can be found along a hiking trail in this small village.

An eerie collection of the surviving structures from a past celebration of the future.

A bookstore dedicated to the intersection of comedy and art.

An open-air "garden" of mural art that changes weekly.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

A temple to modernity, tucked away amid Barcelona's more well known museums.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Mountain where Jesus was first tempted by the Devil.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

This semi-secret storybook hedge maze is also the oldest garden in the city.

The haunting remains of a World War I fort perched atop a mountain.

Deep in the forest of northern Denmark, this secret underground bunker was built at the height of the Cold War.

The world's most charming instant portrait studio also happens to be its smallest.

Contrasting the old concrete courthouse beneath, a modern and colorful residential marvel has emerged, stirring both acclaim and controversy.