Recommend me mystery documentaries please.

[aaron]

Hey guys, I just watched 'Resurrect Dead: The Mystery of the Toynbee Tiles'. It's a documentary about the mystery of hundreds of tiles found in states in the US, and in a couple places in South America - and no-one knows where they've come from and who created them.

It's a great, little document full of suspense and mystery.

Can anyone recommend any more doc's like this?

Thanks in advance.