Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's oldest bookshop still in operation.

Mountain where Jesus was first tempted by the Devil.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Where manatees are the snowbird vacationers in these balmy Florida springs.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Stay in a room with a view... of the bottom of the ocean.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A notorious Route 66 eatery once frequented by Al Capone.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

This pair of small sea rocks has been "wed" using rope and ancient Shinto tradition.

Bioluminescent firefly squid light up this Japanese fishing port.

The original "capsule building" is a masterpiece of Metabolist architecture.