Tiny memorials honor individual victims of the Holocaust.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

Where once there was a train station bathroom, there is now this German burger joint.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

Giant marble phalluses on the sacred island of antiquity.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

Large collection from the 3rd millennium BCE.

Legend says this sacred tree was a gift from goddess Athena.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

UNESCO-protected ancient burial ground.

A collection of art from Bulgaria's time as a communist state.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

An unfinished Serbian Orthodox church with 1,389 golden crosses planned to represent the Battle of Kosovo.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

A futuristic, brutalist masterpiece that is also strangely prison-like.

Backwards hour and minute hands and a timing mechanism that fluctuates with the temperature led to this clock tower's local nickname.

Structure built from the skulls of vanquished foes.

This small bronze pyramid marks the center of Belgrade, but some say it is a Masonic symbol.