A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Ride the subways of yesteryear.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Waterway populated with abandoned projects, including a submarine.

A world-class collection of mechanical musical instruments and automata.

A rare view of a preserved Victorian science museum.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

In the early 1800s, surgery was also a show.

Century-old shop, specializing in Occult products.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Medicinal spa created with the discharge from a geothermal energy plant.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

Microscopic scenes; some call it novelty, some call it art.

Two stunning 17th-century libraries and a cabinet of curiosities.

A crucified and bearded female saint.

A church of bones, decorated with 40,000 human skeletons.