The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

A marvel of Byzantine engineering under the streets of Istanbul.

Ozymandias’ time-keeping temple.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

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

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

Geothermal waterfalls in Tuscany.

Ancient snack bar of the Roman Empire re-opened.

Pompeii's less famous neighbor is still revealing her secrets.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).