The Domes of Casa Grande was four massive structures located in Casa Grande, Arizona, that were built to facilitate the manufacturing of computers in the late 1970s and early 1980s. However, the project was never completed, leaving behind only a few foundations that were started and left to molder. One of the buildings is shaped like a flying saucer, and the other three resemble spheres joined together. Despite their abandoned state, the Domes remain a popular destination for urban explorers and photographers, drawing visitors to their otherworldly appearance.