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

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

A cemetery housing wild west legends in South Dakota.

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

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A grassy pyramid named after a French battle.

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Native Americans built this circle of stones, which was used to predict astronomical events.

The first declared National Monument in the United States.

Every president in history is immortalized in bronze in downtown Rapid City.

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

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

Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Hear the quietest sound from across the dome.

The most visited, and possibly most controversial, museum in Germany.

Building Men of War and Indiamen from Holland's Golden Age.