Don't worry — even though they look real, these giant spiders are just 3-D paintings on the roof of the Seattle Center Armory in Seattle, Washington. Muralist Marlin Peterson painted these two Opiliones, or "Harvestmen" arachnids in August 2012 through a grant from the Washington State Artist Trust. Situated just under the iconic Space Needle observation tower, the mural is viewed from above by nearly 1.3 million visitors per year.