Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The Siege of Naarden ended in 1814, but the cannonballs embedded in the town church remain.

Revitalization efforts converted a former U.S. military heliport into a sprawling urban park.

A thought-provoking outdoor art installation sits in the seat of German law.

A bridge that has seen many reiterations over its lifetime.

When a missile testing site was proposed near this site in the Outer Hebrides, this statue was commissioned in response.

A church of bones, decorated with 40,000 human skeletons.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Perhaps the most spectacular grotto along the Algarve coastline.

Get a close-up look at a 16th-century Basque whaling ship at this factory and museum.

This remote church calls a tiny island its sanctuary.

An enormous Soviet aircraft, the only one of its kind, stands at the deserted shore of the Caspian Sea.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Frequent fliers welcome in this airplane hotel.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

A decommissioned Soviet airplane has been used as a movie theater and a cultural center.

A supersonic jet stands on a pedestal in this rural village as a monument to military aviation.

An icon of the Battle of Britain is frozen in flight in a grand Victorian museum.

A giant glider—designed by the father of the Rubik's Cube's designer—now soars within a shopping mall.

This French chateau is home to the world’s largest private collection of fighter jets.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

This medieval Italian village was transformed into an architectural marvel by the famous "Papessa" Donna Olimpia.

The university library shaped like a giant piece of Swiss cheese.