This 1,400-year-old abbey was once a powerhouse for music and intellectualism known across Normandy.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

Lavish royal estate punctuated with heated greenhouses.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

Medical history with an amazing, if frighting, collection of wax diseases on display.

These ruins reveal the remarkably intact layout of a Roman marketplace.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

The ruins of a castle sat decaying in this park for years before a massive renovation restored this area to its past beauty.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

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

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

An industrial relic is now one of Europe's most staggering art spaces.

No need to strap in for a "ride" on this walkable roller coaster.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

This museum is filled with an eclectic collection of unique inventions.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Perhaps the most spectacular grotto along the Algarve coastline.

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

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

Underground attraction offering tours of the foundational ruins of a church nave that collapsed in 1674.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.

This now abandoned restaurant provides some of the most amazing views of Lisboa.