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

A former major munitions plant that has been converted into a sprawling art space.

An original apothecary from 1792.

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

At 207 feet, one of the world's longest continuous escalators.

The site of the climactic scene from the classic horror film is now a historic landmark.

Home to items never before seen by the public.

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

Giftshop catering to cryptozoologists and anyone with a sense of humor.

Largest Roman Catholic church in North America.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

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

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A local farm's collection of unusual structures from a now defunct storybook amusement park.