A relic of FDR's brief foray into utopian urban planning.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

The whole world in one water tank.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

Built by the patriotic residents of Boonsboro in a single day.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

Ship skeletons haunt Baltimore's waterways.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

An astounding collection of medical specimens, including bits of President Lincoln.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The world's largest fully steerable radio telescope.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

A historic coal mine that doubles as a museum and tourist attraction.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A surprising, but overlooked example of geology in the middle of the nation’s capital.