One never knows what strange artifacts might be found out in public landscapes. It is amusing enough to find items discarded or simply misplaced long ago by former occupants of a home out in a private home garden. Public landscapes are even more interesting, since they collect debris and artifacts from many more people. Some landscapes have been doing so for a long time.
Besides litter, the most commonly found artifacts are sporting equipment. Frisbees, baseballs, tennis balls, soccer balls, volleyballs and such are commonly lost in dense vegetation. Golf clubs, baseball bats and tennis rackets sort of make one wonder. Chew toys are sometimes left by dogs who go after them, but then return with something they perceive to be more interesting.
Landscapes that are near roadways often feature car parts that might have fallen out of cars as they drove by, as well as a few that cars could not have driven by without. Obviously stolen items, such as purses and wallets, often surrounded by a few credit cards that they likely contained sometimes appear. Stolen mail might fit into that category.
I have yet to find anything as interesting as tickets to a San Jose Sharks game, a big bag of money, Elvis, a purple dinosaur from another plant or a flying saucer that brought it here. However, I have found evidence of time travel!
A retaining wall that holds back an embankment above a parking lot at work was apparently constructed by Mike Menard in 1982, who left his name and the date inscribed into the concrete on top of the wall. That by itself is nothing too remarkable. What IS remarkable is that an adjacent retaining wall was constructed four hundred years later, and three hundred and sixty-four years from now, in 2382!