Commemorating the spot where the famous scientist fed his pigeons.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Cryptic messages embedded in the New York City sidewalk.

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

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

Elevated freight railway turned wildly successful urban park.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

A roadside shrine to a late rock god only remains thanks to the unyielding efforts of his fans.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Half-drowned wooden stumps and stone blocks are all that remain of a Victorian landing that was destroyed by storms.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

Giant naked man on a hillside.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

This memorial to the thousands of Indian dead during WWI was callously used for target practice during WWII.

This collection of reclaimed landmines acts as both an exhibition of their deadly history and as a shelter for children affected by them.

This tunnel entrance is built to resemble a grand castle but no one is quite sure why.

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

Macabre astrological automaton clock dating to the late 1400s.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A monument celebrating the idea of reaching inaccessible places.