Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

The oldest active mini golf course in the U.S. has an elegant Art Deco style filled with lush tropical plants.

A 2,500-pound wooden nickel makes this woodworking museum easy to spot from the road.

The 40-foot-tall votive candle is the largest of its kind.

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

Ruins of a once-opulent grand Victorian resort.

A reconstructed World War I-era communications array that was once hidden in plain sight.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

A bronze of the man in all his sinewy glory celebrates his longtime connection to the Ohio city.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

The Fun Farm weaves fairy tales, myths, and magic into a magnificent collection for visitors to explore.

A gregarious Ohio resident has been building his whimsical temple to peace for decades.

A floating museum that was sunk by a flood and left to rot in the tides.

This mosaic-covered bar is brimming with curated curios.

The center of the only hemisphere that awards visitors with a commemorative coin.

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

This restored house is like a time capsule of the president's unconventional inauguration.

This sprawling collection of saintly relics includes such fascinations as wood from the Cross of Jesus and threads from Mary's veil.

This hidden park hosts a rogue’s gallery of eccentric architectural obelisks.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.