Landscape architect Charles Jencks created this enormous installation, called the "Crawick Multiverse," in Scotland's Nith Valley, and in addition to being incredibly cool—the different parts are meant to be physically representations of theoretical physics concepts—it is really going to throw the aliens for a loop when they eventually discover a human-less Earth and have to piece together what happened here. They'll probably end up basing a fictional worldwide religion around this place and decide that churches were just really nice houses.
· At Scotland's Crawick Multiverse Garden, You Can Look into the Void [Gizmodo]
· The Duke, the Landscape Architect and the World's Most Ambitious Attempt to Bring the Cosmos to Earth [Atlas Obscura]
· Crawick Multiverse [official]