I've been looking into an unusual type of lunar crater - the concentric crater.
One of the easiest and best to see is Hesiodus A
The pictures were taken over 3 nights
Hesiodus-A-1 July 21st
Hesiodus-A-2 July 20th
Hesiodus-A-3 July 19th
You can find out more about these objects at
http://adsabs.harvard.edu/full/2006JALPO..48d..27D
and
https://skyandtelescope.org/observin...aters02252015/
RichardJ