This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This giant sculpture made of trash is a critique of society's wastefulness.

This single-track road rewards brave drivers with stunning Scottish scenery.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

A swath of France so devastated by war it is still forbidden to go there.

It's a mystery how these curious columns wound up in an Edinburgh suburb.

The narrowest street in Paris.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

Locals affectionately dubbed this World War I memorial "Tommy."

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

A rare example of this century-old British tank stands near the center of town in Ashford.

This spectacular track has run continuously since 1882.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

Unlike most arches, this geological oddity formed in a volcanic dike.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

Historical figures from New York City's Catholic community reside in Midtown.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.