Originally a busy mercantile exchange and meeting place, this exquisite piece of architecture was built between 1420 and 1452 by Guillem Sagrera. Although very quick to walk around, it is certainly an experience. The ribbed vault ceiling is divided into twelve parts, each with its own spiral pillar resembling the palm trees lining the outside pavements. The lovely Angel Custodio was made by the architect himself and holds a band reading ‘Defender of Merchandise’. Make sure to speak when you visit, if the hall is quiet, to experience the famous echo.