Postcards of things that are larger (or smaller) than life, mythical beasts, space ships, etc. These postcards are often referred to as "exaggeration" postcards. Mostly from the days before Photoshop, when seeing (the postcard, at any rate) was believing. Well, maybe.
Tell a little about where the postcard came from (or where it was postmarked), or make up your own tall tale about it.
Just to be perfectly clear, this group is for postcards that you could send through the mail to friends and family back home, so no porn.