A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

A mechanized clock where a man fights off a dragon, crab, and rooster.

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

Notorious artist squat renovated into legal studios.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Go inside to really appreciate this 500-year-old technological masterpiece.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

A 12th-century fortress containing some of Berlin's oldest buildings.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Rising from the sea like a stone monster.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Europe's second largest ossuary wasn't discovered until 2001.

A battle between nature and architecture in the Cambodian jungle.

Five candy-colored villages on the Italian Riviera.

The stunning interior of this Gothic church is covered in ornate gold details.

A perilous medieval road leading right into the sea.

Surreal riveted sea forts once protected the Kent shores from German attack.

For just a few hours each morning, this market serves specialties from the city's shrinking Chinese-Indian community.

This deserted palace is one of the finest examples of Indo-Islamic architecture in India.

This colorful colonial neighborhood in Panjim is one of the only Latin Quarters in Asia.

India's first open-air public art district sits in the heart of the country's capital.

The largest freshwater lake in northeast India is also the only floating national park in the world.

Megalithic monuments resembling magic mushrooms.