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

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

This super steep hike ascends 2,000 feet in less than a mile.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

There are eight natural springs around town, each with a slightly different taste.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Turning night into day in Victorian-era Austin to thwart a serial killer.

To honor a beloved Austin radio DJ a neighborhood bridge has been covered in a loving mosaic.

A former electrical substation is now home to an eccentric junk art masterpiece.

A grove of colossal man-made flowers built to collect the sun's rays.

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

Locals dubbed it the "Owl Building" because of its bird-like appearance.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.