A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

A museum devoted entirely to the rattlesnakes and snake-related art.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

This gravity-defying rock formation is one of Big Bend’s natural wonders.

One of the last remaining movie theatres in the country that features a rear-projection system.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A preserved factory in the "Home of the Carrousel" is now a museum dedicated to the classic wooden ride.

More than 350 million years ago, western New York was covered in a vast sea. Today, you can dig up the remains of the plants and animals that lived there.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

The only boathouse Frank Lloyd Wright ever designed was also the only unbuilt structure in his famous Wasmuth Portfolio, until 2007.

Buffalo's abandoned concrete grain elevators are getting a second life.

The seat of Buffalo government is a gorgeous Art Deco palace.

Antique skeletons and taxidermy creatures were found crammed in a university closet.

This New York estate was designed to resemble a medieval Scottish castle.

This underwater old Texas hill town only resurfaces during harsh drought.

Steep canyon walls hide a forested oasis in the West Texas desert.

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

One man's homage to the orange as realized through a long-term folk art labor of love.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

Ruins of a once-opulent grand Victorian resort.