The small seaside holiday resort of Porto is watched over by the 16th-century Genoese Tower standing guard over the fishing harbour, and although crowded in summer, retains a certain charm. While on holiday, Porto is an excellent base from which to explore the surrounding countryside and spectacular coastline. This region of Corsica is so full of natural beauty that it has been designated a UNESCO World Heritage Site so visitors are truly spoilt for choice when it comes to stunning landscapes. The Gorges de Spelunca, a spectacular ravine, is popular for its rocky pools, Genoese bridges and hiking opportunities, while the Forêt d'Aïtone is one of the island's most beautiful forests, with waterfalls and numerous walking trails. Visitors can head out on boat trips as well, and easily access some of the famous calanques along the coast, and the nature reserve of Scandola. The main historical sightseeing attraction is the 16th-century watchtower perched dramatically on the cliffs and boasting phenomenal views. The town itself is not spectacular and has sprung up mainly to meet the demands of the visitors who flock to the area for the natural beauty.