32. Megalithic Temples, Malta

On the island country of Malta, there lie a series of temples constructed over the course of thousands of years. Indeed, it’s been claimed that these temples are the oldest free-standing structures in existence, and the neighboring (half-buried) Göbekli Tepe complex is believed to be far older.

What’s especially remarkable about these temples is they exhibit construction techniques not seen anywhere else for thousands of years… ancient aliens?