5,000 skulls in memorial to those killed by the Khmer Rouge.

The old ceramics factory on Boa Vista shows the power drifting sand has to destroy buildings.

An incredibly salty lake inside the crater of an extinct volcano.

This ship carrying cargo and four church bells for the Catedral Metropolitana Nossa Senhora Aparecida ran aground in 1968.

Once a bustling fishing village and trading post, today these Cape Verde ruins provide a home only for seabirds and turtles.

A bronze tribute to Mika Häkkinen's 1998 Monaco victory.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

At less than four inches in height, this iconic fictional character is the smallest public statue in all of Moldova.

A World War II-era sign in Valletta is a reminder of when Malta was besieged so severely that food needed to be rationed.

Valletta’s outdoor theatre stands within the ruins of a 19th-century opera house.

Dynastic Home of the De Piro Family.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

A centuries-old forgotten underworld lies beneath Malta.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

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

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

This small chapel built into rock is the oldest place of worship in Luxembourg.

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

A unique, playful portrayal of Jesus as a backpacking traveler.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

An abandoned masterpiece of Soviet Brutalist architecture.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

A monument to peace, built by one man over the course of 25 years.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.