A modest walled graveyard where nobody is actually buried.

Nature (and graffiti) reclaim this old waterworks that has been surrounded by a bike path and network of walking trails.

The ruins of an open-air theater built on this Georgia island in the 1970s.

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.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

Carved faces add a touch of magic to this island's impressive oak trees.

A grassroots community effort in the 1970s led to the creation of this beautiful garden full of delightfully whimsical exhibits.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

Healing Springs that once ran red with soldiers' blood.

Hidden amid the old-world charm of Savannah is a museum dedicated to the world of oddities and criminal history.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

Bad farming practices caused this unnatural natural wonder.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A rusted blade sticks out from the trunk of this tree, left as a memorial to a young man who left to fight in the Civil War but never returned home.

Explore the dark underground corridors of this graffiti-covered former military fortification.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

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

An abandoned relic of the city's failed experiment with below ground transit.

Take a drunken tour inside the world's largest known geode.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

This railroad tunnel was once the longest in Massachusetts.