The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A priceless collection of the Nation's cryptologic history.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

An original apothecary from 1792.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

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

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

The United States Capitol's former columns still stand.

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

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

The house where John Wilkes Booth conspired with his co-conspirators.

Home to items never before seen by the public.

This grand gothic brewery has been pumping out suds for over a hundred years.