This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

An ordinary rancher stumbled upon one of the world’s largest collections of Pliocene horse fossils.

Three generations of intrepid collectors display their curious artifacts in a homemade museum right next to the caves they discovered.

A display of magnificent stained glass windows is the first exhibit of its kind.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

Illegal drag racing two stories beneath Chicago’s streets.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Just a man taking his prehistoric pet for a stroll.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.

A cemetery housing wild west legends in South Dakota.

This vintage train once gave new meaning to “swimming upstream.”

The first declared National Monument in the United States.

A memorial to the most decisive Native American victory of the Plains Indian War.

The only road through the heart of Glacier National Park.

This U.S. natural reserve is an ancient spiritual place and rock climber’s paradise.

No Gordon Lightfoot song, only a barebones monument to greed.

This museum details the history of a local miracle: The return of the critically endangered black-footed ferret, which was once believed to be extinct.

This archaeological dig site and museum is home to one of the largest dinosaur fossil collections in the world.