Seriously, I was stuck at 999 for a week. Every day I would (almost) run down the stairs to check the mailbox. And every day I would slowly drag myself despondently back upstairs after seeing it was (almost) empty.
and.... it is a lighthouse! well, actually several lighthouses.
I change my profile every few months adding and subtracting themes for cards, and only added lighthouses in November.
Interestingly, three of the four previous cards were also lighthouses (all received on the same day), each from a different country.
Germany (right) and Poland (although it is of Annisquam Lighthouse in Maine)