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

An ancient Egyptian temple sits within a modern European museum.

This early 19th-century graveyard is the final resting place of Vincent van Gogh's mother.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

A historic observatory precariously perched at the "Top of Europe."

This local emblem is the oldest and largest dragon tree in the Canary Islands.

The Jesus tree of Malta bears a striking resemblance to Christ on the cross.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.