Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

This failed condo development was reborn as a street art hub.

Now abandoned, this East Austin school for the disabled began as the "State Colony for the Feeble-minded."

A view-altering observatory at the University of Texas.

DIY collection of eclectic holdings.

One part antique store, one part curiosities hodge-podge.

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

Continuing the tradition of the dime museum in style.

A natural rock formation believed to be a cure-all.

A museum and apothecary garden devoted to the history of frontier medicine.

A peculiar forest that was handcrafted for government experiments.

This highway overpass was named after the tragic disappearance of a young mother who got mixed up with the wrong people.

This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

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

Along the historic Mother Road is an old gas station with a secret counterfeiting past.

This former mining town was named the most toxic town in America.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

An acoustic anomaly with a mysterious cause.

Montreal's colorful subway station shows its support of the local LGBT+ community.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

This 1967 experiment in modular architecture was designed to be a new model for urban living.