A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

One of America's first planned communities is preserved in a state park.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

The Bong-area park police have asked visitors to please, stop stealing the signs.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

Meet manatees face-to-face at this zoo for native species.

World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

Foragers once flocked to this big beautiful bayou to hunt for pearls.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

Who knew the Devil's domain was a hot spot for tubing?

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

The only Florida state park with publicly accessible caves.

One of the best places in Florida to spot rare, carnivorous pitcher plants.

Located within a historic park, the beacon is the oldest standing structure in Miami.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

This natural wonderland is a unique chance to explore a Carolina bay, a mysterious geological formation of unknown origin.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

The eerie ruins of a remote abandoned hamlet said to be founded by the survivors of a shipwreck.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.