A mental health hospital dating back more than 139 years, now features a museum.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

This amazingly preserved Gold Rush town is a historian's dream.

This museum glorifies the humble potato.

A 131-year-old wunderkammer of Texas history.

These boots are made for selfies.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

A medieval castle in the middle of rural Texas.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A Prada store in the West Texas desert that is never open for business.

Fantastic collection celebrating the final send-off.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

A Victorian mansion, painstakingly reproduced to appear just as the the Munster's family home did on TV.

An emerald-green grotto just a short trip from Austin.

A popular swimming hole that hides one of America's most deadly diving spots.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The 19th-century ruins hide deep in an overgrown forest.

A small town built on an abandoned airfield has former runways as streets and a bar and grill in an old airplane hangar.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

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

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.