HERE IS A NASA PRINT with some very strange and obvious building like structures in the bottom of the crater. It appears as the roofs has collapsed, so it must be very old and no longer in use. Don't you wonder who was living or working in them ?
HAVE YOUR OWN WEB SITE OR BLOG, without knowing computer language. Simple to create. Simple to add new material. If you are a car-buff, create a family blog, like to put all your pictures from your travels on it, or sell merchandise, this is so simple - - even I can do it. Try it out. "Simplesite" really is the simplest.