Traditional 11th-century outdoor tannery.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The most metal church of all time was built in record time because of an international, pious pissing contest.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

A fountain standing as a testament to a doomed alliance.

A tiny park in the middle of some big power politics.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

The fairy tale castle of the "fairy-tale king."

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

The world's largest boar is a huge steel titan found at a French rest stop.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

This natural sea arch highlights Ireland's rugged coastal beauty.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

This fortress-like monastery is covered with intricate frescoes.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.