A region in which the nature is rich and varied. The Adriatic Sea, from the flat and sandy coast, interrupted sometimes by cliffs that fall down abrupt on the sea; the deep and mysterious grottos; the natural protected areas are embellished by cities, palaces and religious buildings almost always enriched by architectural and artistic elements of great relief. It is the case of Ancona's cathedral, the capital of the region, important port of the Adriatic Sea or of Pésaro's cathedral. In Urbino, the Ducal palace is the surprising proof of the grandeur of the Renaissance.