A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The hallucinogenic center of the ancient world.

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

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

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

Ancient mysterious ruts carved in the bedrock.

The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

This unique building in the main square stands out among the city's typically Baroque architecture.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

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

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

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

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

This small 16th-century church in Athens is almost entirely surrounded by a modern building.