This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

The larger of two volcanic peaks rising out of the crystalline waters of the Caribbean.

Come for the springs; stay for the mud bath.

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

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.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This abandoned five-star hotel is now a five-star urban exploration destination.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

A multiversal transit station located right below a highway interchange.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

Travel through the wholesome amusements of yesteryear at this charming miniature village.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

The remains of the dam that unleashed a 15-foot wall of water on Denver.