Commemorating the spot where the famous scientist fed his pigeons.

New York City's first Modernist house.

A terrific purveyor of natural history objects and curios.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Slyly buy a shake in the Parker Meridien lobby.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

Protecting the dead from opportunistic body snatchers.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A sweet symbol marks the place where torturous executions were once carried out.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.

Yo, Adrian!

This elaborate towering structure was once famed for its revolutionary height.

The Buddhist temples of Yamadera, built into a mountain side, feature a viewing deck with sweeping views.

A tall karst islet popularized by 007.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.