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

Ship skeletons haunt Baltimore's waterways.

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

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

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

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

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

A science teacher's dream.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Century-old shop, specializing in Occult products.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

The abandoned coal loading dock is a canvas for unsanctioned art.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

Huge masonic hall in Philadelphia with lavishly themed rooms.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The loneliest island in New York.

This natural wonderland is a unique chance to explore a Carolina bay, a mysterious geological formation of unknown origin.