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

These fantastically named natural pools look like something out of a Scottish myth.

Some of the world's only freshwater seals live in one very special lake in Russia.

Former prison camp dedicated to the victims of political repression.

This restored 17th century synagogue is one of the few remaining structures in Morocco’s ruined Jewish quarters.

The designated Jewish quarter in Fez dates back to the 15th century.

This 16th-century Moroccan fortress-turned-armory museum offers prime views of the historic quarter in Fes.

The other side is actually green.

Mosaics, storks, and brothels—this ancient city has it all.

A hidden three-foot-wide house separates these two regal churches.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

A musical instrument played by the sea.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

The statue honors a beloved bird that once roamed St. George's Market.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The 5,000-year-old megalith is believed to be Scotland's tallest standing stone.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.