Space Mountain (currently called Hyperspace Mountain) is a space-themed indoor steel roller coaster in Tomorrowland at Disneyland in Anaheim, California. Opened on May 27, 1977, it was the second roller coaster built at Disneyland, and was the second of the five versions of Space Mountain built by The Walt Disney Company. Its exterior façade is one of Disneyland's four "mountain" structures that serve as park landmarks.