Of course, one of the kinds of postcards I request are spooky, eerie ones. Here are some of the wonderfully Halloween-appropriate postcards I've received.
This one is from Germany.

These are from Lithuania and Japan, respectively.


These are from Russia and Germany.


“Henderson sighed. There was a time, he reflected, when the coming of this night meant something. A dark Europe, groaning in superstitious fear, dedicated this Eve to the grinning Unknown. A million doors had once been barred against the evil visitants, a million prayers mumbled, a million candles lit. There was something majestic about the idea...”
― Robert Bloch, "The Cloak" (1939)