Sardinia, a large Italian island in the Mediterranean Sea, boasts nearly 2,000 kilometers of coastline, sandy beaches, and a mountainous interior crisscrossed with hiking trails. The island's rugged terrain is scattered with thousands of nuraghi—mysterious Bronze Age stone structures shaped like beehives. One of the largest and oldest of these is Su Nuraxi in Barumini, which dates back to 1500 B.C.