Haunting graffiti left by prisoners of the Spanish Inquisition.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Less a museum than a bizarre fantasy world created by artists and engineers.

A treasure trove of rare and fine fabrics from around the world.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A terrific purveyor of natural history objects and curios.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Every last book in this bookstore is signed by the author.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

Great Britain's only hat-making museum.

This beautiful example of Victorian engineering is the oldest water-balanced funicular anywhere in the world.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Huge spherical rocks in the middle of the prairie.

The biggest museum dedicated to insects in North America, one of the largest in the world.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

Mongolian Buddhists believe this monastery in the Gobi desert to be the center of the world's spiritual energy.

These Nubian pyramids are strange and unique, even by pyramid standards.

Ozymandias’ time-keeping temple.