Step back in time and discover the natural rock formations in Aruba. Pathways are in place to better explore these ancient sites. For such a relatively flat island, the presence of the unusual hills and huge monolithic boulders in Aruba are truly an enigma. There are two mystical giants open for you to climb and explore: the Ayo and Casibari Rock Formations. These remarkable natural wonders add aesthetics to the landscape, as well as provide excellent vantage points from which to better view the island.