A 15th-century manor built by Afonso, the illegitimate son of King João I, in a Burgundian-influenced style that has nothing in common with the rest of the city — brick chimneys lined up like dominoes on the roof, slate-tiled gables, deep cloisters. The dukes only lived here for a generation before moving to Vila Viçosa in the Alentejo; the building was a ruin for centuries before the Estado Novo's heavy-handed restoration.
The interior is now a museum, with tapestries, Persian carpets, weapons, and the kind of dark, oak-furnished period rooms you would expect. The chapel and the banqueting hall, with its inverted-hull wooden ceiling, are the highlights. Open daily except Mondays.