The highest point in Texas is capped by a big silver pyramid.

The world's longest known cave system.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This chestnut box will not be opened until the country music legend's 100th birthday in 2046.

This dam is part of the nation’s largest public power producer and a historic steward of Hiwassee River.

This museum pays tribute to the Cherokee leader who created a written language for his people.

Enormous lake at the bottom of a unique cave system.

These free-roaming horses were once destined to disappear from the land.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

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

A sharp bend in a dramatic river canyon cut through red rocks.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This quiet park's strange sedimentary spires were named after Kodak's color film.

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

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

A kitschy stop on the way to Zion National Park.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The second oldest continuously operating bar in Louisiana.

One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.

A kaleidoscope gallery and steampunk emporium named for a pioneering journalist.

A Wild West jailhouse that slid down the mountainside.