Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

An old Danish political institution where members of government can grab a drink off the record.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

A former taxidermist has turned his old shop into a folk art mecca.

A wondrous old library overlooking the nation's capital.

A small museum dedicated to the whimsical tool that turns sugar cookies into works of art.

A chessmaster's dream destination.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

An urban forest overtakes what was the greatest failure of utopic urban housing.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

An abandoned concrete jungle surrounded by a lush park.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

Community bookshelf of 25-foot-tall book spines.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Try not to get slimed in Tribeca.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

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

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

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

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Bizarre Cavern.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.