The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

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

The largest whale museum in Europe allows visitors to walk among life-size giants.

This stunning concert hall has become a symbol of Iceland's national recovery.

An encyclopedic collection of mammal penises.

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

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Collect holy water from a Bronx grotto.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

The oldest continuously inhabited street in America.

"A hideous albatross in the Hudson River Valley."

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A semi-scholarly approach to sex.

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

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.