Only known mainland rookery of the threatened Stellar sea lion.

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

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

100-year-old shipwreck you can walk up to at low tide.

2300-year-old Roman road connecting the empire.

A house carved into a rock in the 1940s.

The drama of nature in full effect in this Nevada State Park.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This massive redwood tree has a hole in the base big enough to drive through.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

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

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A beautiful geyser under environmental threat.