This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Florida's first suspension bridge.

This historic oak tree has been around for over 300 years and might last for 300 more so long as it doesn't fall apart first.

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

This small museum is dedicated to the history of Havana and Florida's once-booming tobacco industry.

Come for the boats, stay to explore the intriguing assortment of art.

The bottle house obsession struck a Florida man in his retirement, and now he can't stop building.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

Off of the Crawfordville Highway in Florida, nature is taking back this decrepit row of Ford trucks.

This arcade is one of the last places to catch a public performance by the now-defunct ShowBiz Pizza's house band of animatronic animals.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A historic coal mine that doubles as a museum and tourist attraction.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

An approximately 500 million-year-old rock outcropping covered in fossilized bacteria.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

An ideal wedding spot that is almost too ideal.

This park contains a number of standing stones meant to heal and inspire.

A sacred collection of indigenous rock art.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

Holding the most bodies of any cemetery in the United States.

Known as one of the most famous parks in Honduras.