This slowly crumbling mansion was home to one of East Africa's richest and most powerful slave traders.

A vast collection of rare, historical, and vintage supercomputers.

A winding district gerrymandered into the shape of a mantis.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

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

A museum dedicated to exhibiting remarkable outsider art.

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

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

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

This free, take-a-book shop seems like a trick but isn't.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Its diverse collection of computers and technology spans the ages.

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