Fodor's Expert Review Museu Nacional de Machado de Castro
One of the city's most illustrious museums, the Museu Nacional de Machado de Castro sits on the site of a vast Roman cryptoporticus (a maze of underground storage vaults). The building above, constructed in the 12th century to house the local bishops, was extensively modified over the centuries and finally converted into a museum in 1912. The Bishop's Chapel, adorned with 18th-century tiles and silks, remains a highlight. The museum is notoriously difficult to navigate, although there are plenty of staffers on hand to point you in the right direction. As you exit the museum, note the large 18th-century azulejo panel depicting Jerónimo translating the Bible.