This unattributed sculpture in Amsterdam is hiding in plain sight.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

An ancient necropolis of magnificent tombs.

A crumbling ghost town with prime views of the dam that doomed it.

This 700-year-old Cyprus castle is the birthplace of the world's oldest wine, said to be toasted by Richard the Lionheart at his wedding.

This winding road through an Italian canyon may be the most scenic drive in the world.

Two stone columns flank the grand Venice square, but there were supposed to be three.

100 year tradition of fist fights, marked by marble footsteps.

A rare example of World War I trenches from the British front.

The Belgian library displays burned books that were salvaged from the fires of both world wars.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

Christ's blood allegedly preserved in a Belgian town.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

The Citrus Variety Collection at UC Riverside contains two trees of each of the 1,000+ varieties of citrus.

A beer pipeline runs beneath Bruges.

A Sri Lankan tea factory's ironic take on the Los Angeles landmark.

What was once a bustling mining installation is now a bustling hub of contemporary art.

This former quarry is now a picturesque gorge that hides a sunken lake.

Macabre astrological automaton clock dating to the late 1400s.

Walk through Czech history in Prague's largest graveyard.

A church of bones, decorated with 40,000 human skeletons.