The first partially complete dinosaur skeleton was discovered here, forever changing the world's view of the ruling reptiles.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

One of the oldest of its kind.

A curious building honoring past and current members of a historic musical comedy troupe.

This beloved marketplace mascot poops money and grants good luck.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

A winding district gerrymandered into the shape of a mantis.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A museum dedicated to exhibiting remarkable outsider art.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

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

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

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

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

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

The trials and tribulations of marking Poe's grave.

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

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 remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

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