Legend says this demonic carving inside a medieval cathedral was one of Satan's minions.

The hallucinogenic center of the ancient world.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

An alchemist's "magic door" stands in the middle of a Roman park.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

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

Ancient mysterious ruts carved in the bedrock.

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

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

These lesser-known Maltese catacombs date back over 1,700 years.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

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

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

Stone Age solar temple is aligned with the sun on each equinox and solstice.