One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Houses are tucked between, on, and underneath giant boulders.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

Artists have long been drawn to these atmospheric 12th-century ruins.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A plaque and memorabilia collection mark where A&W got its start.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

A quick journey through the history of Annapolis.

This Annapolis home was built by one of the signers of the Declaration of Independence.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Run a wash cycle while sipping a latte at this community-oriented café.

A small museum in a ward on the east side of Tokyo showcases the works of one of Japan's greatest ukiyo-e artists.

This work of engineering is imbued with elegance and ingeniousness.

This tiny patch of arid sand sits in one of the greenest states in the United States.

The largest tidal whirlpool in the Western Hemisphere.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Ruins of a Carnegie family mansion on Cumberland Island.