Cydonia is a place on Mars, where the controversial rock formation shaped like a human face can be seen. Doing some further research, there are conspiracy theories that Cydonia is actually a NASA cover up, because there's more than one "human" face there, and evidence of pyramids and a city... Martians may have existed there. Certainly something Matt would be interested in, having said this - there are theories of a great war that destroyed Mars, and the inhabitants had to move elsewhere... to Earth.
"...A great war was fought once in our solar system. One of our planets was devastated because of it. But by the end of it the aggressor was beat back and they were able to rebuild here on Earth."
"The enemy in the war, devastated Mars..."
However, more recent pictures of Cydonia reveal that the faces look nothing like faces at all.