Mountain where Jesus was first tempted by the Devil.

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

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

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

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The first declared National Monument in the United States.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The loneliest island in New York.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

Whitewashed mosque contains the world's largest carpet.

This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

A bizarre house filled with an astounding array of collections.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

This giant temperature attraction created some giant electric bills.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.