"Medieval" castle built in the mid-20th century by one family.

One of the best-preserved medieval streets in Europe.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

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

A sharp sculpture made of thousands of pieces of jagged glass.

Giant marble phalluses on the sacred island of antiquity.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The hallucinogenic center of the ancient world.

The bridge that cost Germany a World Heritage Site.

A famous big wave from Japan serves as a tribute to the victims of the disastrous Elbe flood.

When the rain falls, this drain system turns into a musical instrument.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

With over 10,000 lights, this engineering marvel lights up the city after dark.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.