This razorback ridgeline has doubled as a scenic drive since the early 1900s.

When ecosystems collide in the arid Southwest.

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

The largest self-built castle in the U.S., six decades in the making.

There are eight natural springs around town, each with a slightly different taste.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Less a museum than a bizarre fantasy world created by artists and engineers.

The world's largest collection of the world's largest objects is in one small Illinois town.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

A giant lumpy candle serves as a beacon for this highly scented pit stop.

Deep vertical fissures like miniature slot canyons cut across the cemented volcanic rock of Black Point above Mono Lake.

Race through the maze, get your name on the sign.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

Watch the newest land on the planet form before your eyes.

In 2018, Pohoiki Road was severed by lava flowing from the eruption of Kilauea.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

This legendary urban waterfall creates a dazzling display of rainbows.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

A vertically floating hemlock controls the waves and weather at Crater Lake.