Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

The ancient latrines of the Greeks, in all their public glory.

Ancient serpentine sacrifice holder that has stood the test of time.

A charming beach town in Turkey captures all the colors of the rainbow.

1513 Turkish world map, full of European state secrets and snarky commentary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A marvel of Byzantine engineering under the streets of Istanbul.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Ancient mysterious ruts carved in the bedrock.

These temples are among the oldest free-standing stone buildings in the world.

This subterranean necropolis holds three floors of antler-dug grave caves.

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

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

The video game-themed street art first popped up in the French city.

This bridge was constructed from the rubble of the infamous Bastille.

France's national museum of scientific and industrial instruments.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

France's most famous cemetery, with some of its most curious tombs.