At night, a grove of towering redwood trees growing through the pavement block out all light from the so-called “Dark Park” of Madrone Avenue.

The former Naval shipyard is open for exploring - mostly.

The southernmost outpost of the Russian Empire in colonial America.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

The cardinal directions, set in stone.

The ruins of a paper mill destroyed during the Civil War still tower over a tributary of the Chattahoochee River.

Often referred to as the largest spring in America.

During the 19th-century, this park was a vital trading fort.

The crumbling remains of the first Black-owned and operated hospital in Kansas City.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

A subterranean haunt where wine and homemade biscottis are always on the menu.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

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

European castle ruins in an American state park are actually the product of death and grief.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

Once in disrepair, the house where the 1983 film was shot has been restored and turned into a museum.

A peculiar forest that was handcrafted for government experiments.

Along the historic Mother Road is an old gas station with a secret counterfeiting past.

This former mining town was named the most toxic town in America.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

One of the stops along the fateful journey of the Donner Party.