For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

A grassy pyramid named after a French battle.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

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

Petting this mysterious iron monkey supposedly brings good luck.

Climb inside an iron crystal magnified 165 billion times its normal size.

Lavish royal estate punctuated with heated greenhouses.

Meet the bronze beloved pet to a family of famous peeing statues.

Brussels' favorite peeing boy has a sister.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

Haunting and beautiful trees, doomed to die.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

"Only the devil could play golf here."

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Quite simply the largest tree in the world (by volume).

Columbus' failed colony in the New World.

An old slave lookout in Cuba's historic sugar cane fields.