Dozens of feral felines rule a segment of Hollywood's only graveyard.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

An abandoned town is hidden in Great Smoky Mountains National Park.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Friction between grains of sand cause a curious "singing" sound.

Mile-long cave system near Great Smoky Mountains.

Given just one more year to live, Conrad Schuck built his dream house in Bartow, Florida.

Ruins of a Carnegie family mansion on Cumberland Island.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

Prehistoric animals decorate this popular outdoor park.

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

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

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

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The secret city built by the Manhattan Project.

Here’s how Robert the Doll earned his reputation as the most haunted doll in the world.

A hidden beach at the end of a tunnel of mangrove trees.

Town of spiritualists and mediums in Florida.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?