Don't get it twisted: This is the oldest pretzel bakery in the United States.

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

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

Yo, Adrian!

World's first "penitentiary," meant to be humane, drove men insane.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

People escaping slavery may have hidden inside a corpse vault.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

The first memorial dedicated solely to the Black troops who fought for the Union.

The oldest continuously operating fish market in the United States.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Washington's iconic carousel has a nice piece of Civil Rights history.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

An eerie, decaying ghost town destined to fade into the forest.

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

A museum dedicated to exhibiting remarkable outsider art.

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

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

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

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

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

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

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.