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

An old pay phone rewired to play local bird calls and songs at the press of a button.

Using a massive antenna made up of five miles of wire, two scientists tuned into organic radio waves from the planet Jupiter.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

This bell is one of the last remnants of the lost city of Triadelphia.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

A historic cemetery filled with quirky faux wood art and unique tombstones.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

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

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

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

Explore the legends surrounding these mythical sea creatures inside this museum.

The whole world in one water tank.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

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

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

This abandoned sea fort has become an accidental bird sanctuary.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

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

An abandoned church gets a second life as a massive beer hall and event space.