Or, Take That, Future Archeologists!
I can think of no better use of resources than to mess with the people of the future.
From the Believer:
DISCOVER KYMAERICA: THE GRANDSON OF THE DESIGNERS OF THE MOST FAMOUS PIECE OF MODERN FURNITURE MEMORIALIZES THE SLOW DEATH OF MAIN STREET BY BUILDING AN ALTERNATE UNIVERSE.
This explains menhirs and moai better than anything else, I think; though I may be the only historian who attributes major monuments to whimsy and irony. h/t
Image Cite: flow14, “Carhenge @ Sunset,” Flickr, CC License