The walled Cidade Velha is compact enough to explore in a few hours. The Cathedral (Sé) dates to the 13th century and its bell tower offers rooftop views worth the climb. The former convent housing the Municipal Museum of Archaeology has beautiful courtyards and a collection of Roman mosaics and artifacts from the region. Next to the Carmelite Church, the Capela dos Ossos (Chapel of Bones) is lined with over a thousand skulls and bones from the adjoining cemetery — one of the most unusual sights in Portugal. For something quieter, the Jewish Cemetery on Rua Leão Penedo is Portugal's oldest surviving post-Inquisition Jewish burial ground, a sobering and beautiful place. Beyond the city, the Ria Formosa Natural Park offers boat trips, birdwatching, and some of the best beaches in the Algarve.