Cold war icon and onetime "hole" in the iron curtain.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This working class sculpture pounds his hammer all the livelong day.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Scattered throughout London are ancient remnants of the city's former bounding wall.

What happens when a sculptor has to find a way around a 100-year-old copyright.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The most loyal of little dogs, or a Victorian era publicity stunt?

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

A little sculpture with a large wardrobe.

Home to items never before seen by the public.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The celebrated eyesore created by starry-eyed sweethearts.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.