Since I travel so much, I have decided to leave my mark in these hotel rooms I occupy while on the road. Using the term Zen History, I’m leaving a trail in a very discreet and subtle way. If you’re in a hotel, pull out the drawers in the night stand. Turn them over. If you find my initials there and the year, I’ve stayed in that room.
The other giveaway is the pictures. For years, where possible without causing destruction, I’ve inverted the wall art in hotels across the world. If you find an upside down picture, check out the night table drawer bottoms.
There are other ways to contribute to Zen History. For instance, in our kitchen, behind the fridge is a small section of unpainted wall. As the kitchen is painted, I leave the date and my name. Same with the wood crib and the deck. Just a little date and name crumb of Zen History. Who knows, somewhere, sometime a stranger will come across it and wonder, just who the hell that crazy bastard was.
RoadDave 
I’ve got initials in concrete in 3 separate towns in Illinois. Once I get some materials, I’ll have ’em in concrete down here, too. My other mark is subtle – it’s a particular way of bending wire around the screws on an electrical outlet. It’s only wide-spread use is in telephone wiring, but I’ve used it on all my electrical connections! Yeah, it’s subtle, but one day, some electrician is going to go through the 3 houses I’ve used it on down here (they’re all within 200 yards of each other), see this bizarre wiring method, and wonder “WTF?” 😀