A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

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

"Only the devil could play golf here."

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

A bizarre roadside attraction and the first instance of miniature golf in the world.

What better place to take a seat?

This replica of the Greek structure is in the heart of Nashville.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

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

New Orleans' famous cemetery, located on the site of a former race track.

An oil baron's wild paradise and the winner of an ill-fated air race.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

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

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

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Official museum, hall of fame, and repository of the Texas Rangers.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."