For more than two centuries, the canopy of this venerable tree has been a haven for songbirds and lovers.

This small chapel is built of human bones and decorated with a golden skeleton.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

A 15th-century Corsican chapel that possesses a rare Catholic monument: a "Scala Santa," or "Holy Stairs."

This remarkable checkered church on a Corsican hilltop is fabled to have been built by angels.

Resting on a hill overlooking the coast, these medieval ruins look completely deserted save for their restored chapel.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

A breathtakingly steep set of stairs is carved directly into the face of the sea cliffs of Bonifacio.

This surprising work of art reminds us that La Louvière was once home to one of Europe’s most famous stoneware factories.

The tallest mountain in mainland Netherlands isn't actually very tall.

A once-magnificent collegiate church is falling into ruin.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

This historical Netherlands fortress still bears the marks of its single siege.

This bike path traverses the treetops.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This bike path was sunk below water level for maximum wonder.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

This giant wire frame man sculpture is crouched in contemplation.

The last bastion of Roman presence north of the Alps looms over a German town.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

A jazz band formed by African water animals in the heart of Flemish Brabant.