A plaque and memorabilia collection mark where A&W got its start.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

The only road through the heart of Glacier National Park.

The longest living non-clonal organisms on Earth.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

See massive fossils that are over 200 million years old in northeastern Arizona.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

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

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

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

Four hundred granite steps were built into this massive rock by the National Park Service.

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.

The flow from this waterfall sometimes comes out of springs below its rim.

A modern version of the stone cairns built by the Inuit.

This stretch of Canadian road was named after a nickname that stuck so hard the city had to keep it.

This sign designates the road that leads to the infamous Area 51.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

A facility built in 1992 for an underground nuclear test remains in place today.

A clear blue swimming hole with hidden caves, still unexplored.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

A historic ghost town still worth a visit.