This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Bizarrely-painted church designed by a controversial artist.

At this exhibit on the world of poison, venomous animals steal the show.

This 19th century cyclorama acts like an analogue time machine to a different era.

This museum is a full-size replica of an original church constructed during the 13th-century.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This abandoned Belgian fortress is purposefully being left to nature.

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

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

One of Ireland's most infamous prisons for rebels including men, women and children.

A 141-foot wave of crashing lumber guards the entrance to the Grand Place in Mons.

Petting this mysterious iron monkey supposedly brings good luck.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

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

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

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

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

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

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

A giant bug impaled on a 75-foot-tall needle.