The first permanent memorial to a unique secret weapon of World War II.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

This golf ball–shaped former desert real estate office now houses a UFO museum.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

One of Frank Lloyd Wright's final works was this UFO church.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

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

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

Bad farming practices caused this unnatural natural wonder.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

One of only two pod-shaped homes designed by Frank Lloyd Wright.

An impressive collection is dedicated to the legendary beast.

Visit this playground of waterfalls, caves and sinkholes.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

Live long and prosper in Tennessee.

An odd and heartwarming stone marker enshrines the moment a community saved a farmer's pig that fell in a well.

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

Georgia's highest point was given its strange name thanks to a simple translation error.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.