Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

An oddly conical beacon perched atop beautiful Irish cliffs.

The skeleton of a whale that beached itself in this Irish town is now on display in their public park.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Macabre astrological automaton clock dating to the late 1400s.

This 11th-century structure is one of the oldest churches in Romania.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Baroque celebration of the end of the Great Plague of Vienna.

The topiary maze at the Habsburg hunting lodge.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

An unassuming tribute to engineer William Bald and the workers who built one of Europe's most scenic coastal roads.

The only monument to name all of the passengers and crew who died on the RMS Titanic.