What is the Portuguese Cistern and why is it so famous?
The Citerne Portugaise (Cisterna de Mazagão) is a 16th-century underground chamber beneath the Portuguese city, originally built as an armoury and later converted to a water reservoir. Five rows of Gothic-Manueline vaulted arches rise from columns above a floor permanently covered in a shallow film of water — the reflections double the apparent height and depth of the space, creating an extraordinary interplay of light and architecture. Orson Welles filmed here for Othello in 1952.

