A beautiful geyser under environmental threat.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

The blinking light atop the iconic landmark has been sending secret messages for decades.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Semi-recognized center of the world, with many oddities.

What is the Thing?

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

This is one really big nut.

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."

World's largest collection devoted to one fruit.

A hand-built folk art installation covered with messages of God's love.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Get up close to emus and ostriches, or buy their tasty meat.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

A massive volcanic plug is now a protected area that hosts a number of bird species.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

The unbelievably opulent home built for an infamous newspaperman.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Oldest building in California still in use.