Castelsardo was founded in the XII century by the Genovese family of Doria. It is situated on the summit of a rocky promontory in a strategic position dominating the harbour. The castle and fortifications were built in this time period. Beginning in the second half of the XV century, Castelsardo belonged to the Aragonians. Today, it's considered an important commercial centre for characteristic craftsmanship and is most famous for its baskets made of woven vegetal fibres. Don't miss the Rock of Elephant (La Roccia dell'Elefante) - a rock similar to an elephant with its trunk turned towards the street. This formation is one of the most spectacular manifestations of limestone erosion, a substance often utilised by prehistoric civilisations for the construction of the funeral monuments in the "Domus de Janas".