My 40th card arrived from a town I think I've heard of, but I may be wrong - Bowling Green, Kentucky, USA. It shows a very small section of a place called Mammoth Cave, which is considered the biggest known cave in the world. How cool is that. :-)
Monica is a Terry Pratchett fan like me, and her favorite of his books is Good Omens, which he cowrote with Neil Gaiman. I agree, I really can't recommend that book enough. :-)
The card was sent on January 9th, it traveled 6,905 kilometers in nine days to reach me on January 18th.