In the end, Sumer was invaded by the Elamites who came from modern-day Iran. Narrator: Hello, future people of the UK. Would you like to visit me at the dawn of civilisation in ancient Sumer?

One such structure uncovered in Godin Tepe, an archaeological site within the boundaries of ancient Sumer, included a very curious feature: What looks to modern eyes like two "takeout" windows.

Narrator: Hello, future people of the UK. Would you like to visit me at the dawn of civilisation in ancient Sumer? Well, to do that, you’ve got to travel back in time. Back before the Vikings ...