This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A mysterious monument where a woman who records say never existed was burnt alive for being a witch.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

This 19th-century pub features stained-glass windows celebrating Victorian-era "champions."

Inside this church is an obscure piece of art carved by the famous Alice Liddell.

At night, this glittering musical tunnel draws skaters and photographers.

A large replica of a monumental Roman inscription is located on the side of this museum.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Malaysian fireflies create a dazzling display as thousands light up in unison.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

Tubing through a cave lit with glowworms is a magical underground experience.

The oldest covered railroad bridge still standing in the United States.

It's safe—and permitted—to walk across these twin natural sandstone arches.

A memorial to a larger-than-life legend, inside a county that also holds Bunyan's death certificate.