Curiosity captured the underlying images in late July while approaching a ledge on Mount Sharp, the three-mile-high mountain it has been climbing inside Mars’ Gale Crater. Multiple images captured by Curiosity’s Mastcam were later assembled into a sweeping, high-resolution panorama of the surrounding landscape. ‘The entrance is approximately 6.6 feet tall and 3.3 feet wide, about the size of a doorway in an Earth home,’ Waring said. Mars has produced several famous examples, most notably the so-called ‘Face on Mars,’ which was photographed by NASA’s Viking 1 orbiter in 1976. For now, however, the panorama establishes only that an unusually shaped feature exists in the hillside, not that it is a doorway or evidence of a lost Martian civilization.