The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.

Learn about the sweet, storied legacy of beekeeping in ancient Greece.

A Byzantine-era church hidden in a wooded area below the Acropolis.

An abandoned Byzantine fortress and notorious prison.

A little-known park with unusual, half-ruined structures and a mystical energy.

Where commuters walk through remnants of an ancient Greek necropolis.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

An alien landscape on the banks of the Aegean Sea.

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

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

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

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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Monasteries on rock pillars, once accessible only by frayed ropes.

One of the most controversial statues in Romania is an emperor with no clothes.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This snug medieval lane is one of the narrowest streets in the world.