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

A hidden alley in urban Baltimore is a haven for graffiti artists.

At this former Prohibition speakeasy, electric birds signaled the arrival of hooch.

Eighteen miniature death-scene dioramas.

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

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

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Once America's tallest structure, now a Baltimore landmark.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A museum dedicated to exhibiting remarkable outsider art.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

Two dozen pinball games hidden away inside a most unlikely location.

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

A remote horde of architectural treasures fit for Indiana Jones.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

This general store is more than a century old and home to various oddities and antiques.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.