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

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

Pyramid shaped monument with a tall tale attached.

The Liverpool street made famous by the Beatles is real.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

A restaurant and observation deck built in a unique broadcasting antenna.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

The oldest working Brewery in Britain.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

This historic Benedictine monastery brews a booze so toxic that it has often been blamed almost singularly for Scottish hooliganism.

The oldest inn in England served brew to the crusaders.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

Eighty million natural history specimens call this gargantuan museum home.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The attic of a four-century-old canal house hides a clandestine church.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

A floating cat sanctuary on an Amsterdam canal.

One of only two commuter aerial tramways in the United States.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.