The first declared National Monument in the United States.

This giant green head remembers one of America's jazz giants.

This otherworldly church spire reaches up toward the heavens.

A subterranean haunt where wine and homemade biscottis are always on the menu.

This is not your typical jungle gym.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

Curious cave that stays a cool 56 degrees all year long.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

This abandoned prison castle has become an imposing gallery of graffiti art.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

European castle ruins in an American state park are actually the product of death and grief.

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Georgia may have been on his mind, but this memorial in Florida shows that Greenville was really Ray Charles's childhood home.

Public works and national defense project meant to carve a canal all the way across the state of Florida.

The largest freshwater lake in the Florida Keys.

The futuristic test model of an iconoclastic visionary who wanted to redesign the world.

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

Visit these gentle, bell-bottomed, exquisite equines at the home of North America's first Gypsy Vanner horses.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

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

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

An underwater statue of Christ blesses the depths off Key Largo.

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.