The Arch, also referred to as Rainbow Rock, stands as one of AlUla's most iconic rock formations, and it is definitely worth the 90-minute drive from the city center. Its bridge-like design, resembling a rainbow embraced by two clouds, presents a truly unique spectacle. As you marvel at this expansive exhibition of sandstone, be sure not to overlook the opportunity to discover semi-precious desert diamonds in the vicinity. These vibrant, multi-colored fragments of quartz can be found embedded within the rocks and scattered across the surrounding terrain.