Eritrea has over 2,200 km of Red Sea coastline including the Dahlak Archipelago—more than 200 islands with pristine coral reefs, shipwrecks, and dugong sightings. Massawa is one of the world's hottest cities and oldest ports, with Ottoman architecture surviving war damage. The capital Asmara, set in the highlands, is a UNESCO World Heritage Site for its Italian modernist architecture. Tourism remains extremely limited due to visa restrictions and government control, making Eritrea one of the world's least-visited countries—and its diving among the most untouched.