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

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The most confusing clock in New York.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Rumors of the occult haunt this upscale 1920s hotel.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

Books bound in human skin and H. P. Lovecraft's letters are among a few of the treasures this library has to offer.

A stunning Victorian abbey and walled garden on a lakefront.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

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

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

This bridge was constructed from the rubble of the infamous Bastille.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

A fantastic castle rumored to be the birthplace of King Arthur.

Model aircraft soar over 360-degree views of the countryside at the start of England's oldest road.

The remains of the man who founded Pennsylvania lie in an unassuming grave in the English countryside.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

London's old-school healing garden.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.