An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The romance of early commercial flight still fills this Art Deco destination.

The rogue roots are gradually consuming some of the historic marble grave markers.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

America's first public mental health facility.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The fences outside some of South London's estates are made from recycled World War II stretchers.

High-end antique collection housed in a centuries-old church.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

London's old-school healing garden.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.