The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The anatomical-pathological collection of a man who changed surgery.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

Every St. Andrews student knows to avoid this inscription for fear of a martyr's curse.

Where the U.S. government kept its actual treasure, before Fort Knox.

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

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The "Seinfeld" diner.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

The walls of the iconic dome are hollow and have a secret stairway.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”