The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

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.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Under the desolate and windswept northern coast of Barbados stands a small oasis filled with sea anemones.

This demon atop the Notre-Dame de Paris looks utterly bored.

This bridge was constructed from the rubble of the infamous Bastille.

In France, a medieval-style home pays homage to an intrepid explorer who discovered Québec.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The 28,000-year-old specimen is remarkably intact.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A tiny waterway named after a ghost story.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

A Prada store in the West Texas desert that is never open for business.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This quirky hot springs town known to locals as "T or C" was named after a radio show.