Elevated freight railway turned wildly successful urban park.

Medicinal spa created with the discharge from a geothermal energy plant.

The fairy tale castle of the "fairy-tale king."

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A bizarre house filled with an astounding array of collections.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

World's first "penitentiary," meant to be humane, drove men insane.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The national park was once a plantation estate.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The romance of early commercial flight still fills this Art Deco destination.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.