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

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Cryptic messages embedded in the New York City sidewalk.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Elevated freight railway turned wildly successful urban park.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

A hugely vast Irish landscape of barren rock that stretches for miles.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

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

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

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

Dictionary Johnson’s favorite feline.

An unusual round church in London with a Templar past.