TIL via @AdrianJannetta: There is a lunar feature known as 'Thor's Hammer'. I've put it exactly in the centre here - can you spot it?
Promontorium Heraclides aka 'The Moon Maiden'. Thanks to @Hawaiianimages for teaching me about this feature. Can you see a maiden's head in the right-hand pointy bit of Sinus Iridum?
Here's more about it:
http://www.bitacoradegalileo.com/en/2011/07/27/sinus-iridum-and-the-moon-maiden/
http://www.bitacoradegalileo.com/en/2011/07/27/sinus-iridum-and-the-moon-maiden/