People,
The lunar crater Clavius is interesting. Its rims have some rather straight lines and right angles. There is a smaller crater next to it, just outside of the rim and a smaller crater named Rutherford just inside of the rim in a corner. These two are decidedly squarish.
There is also a small crater plopped down right on top of a rim, with half of the crater on the inside, and half on the outside. It wasn't round, but maybe kind of hexagonal looking.
Rutherford is followed by a sequence of four more craters, each one sucessively smaller. Let's just say that Rutherford seems to have a construction inside of it, and leave it at that.
None of this is natural and it all smacks of artificial constructions.
Cheers!