A quasi-futuristic roof sits atop a medieval Bohemian monastery damaged during World War II.

A bit of retro transportation flair preserved in the world's largest department store.

Turning night into day in Victorian-era Austin to thwart a serial killer.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A Manhattan office building is home to the world's largest chess board.

A view-altering observatory at the University of Texas.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This ancient Egyptian obelisk still bears the wounds of World War I.

A public display of random paleontology.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

More gold than anywhere else, ever.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A crumbling hospital from the 1850s on Roosevelt Island.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A unique tribute to the millions of animals who served and died for the British military.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A dilapidated dock tells the story of Titanic's missed arrival.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Denmark's famous pseudo-hill.