This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A painfully obvious spy house sits right across the street from the Russian Embassy.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The United States Capitol's former columns still stand.

This simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

One of the last active volcanoes on the Eastern seaboard.

A small Richmond island dotted with the remnants of hundreds of years of history.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

The crumbling ruins of this southern American fort have survived storms, war, and cults.

Pirates had to be ousted from the land where this now ruined Louisiana fortress was built.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

The crumbling remains of a 19th century fortess.