Sant Antoni Market (or Mercat de Sant Antoni in Catalan) was constructed in 1882, situated in the district of Sant Antoni. Its modernist in style with a metal structure running throughout, and is a work by the Catalan architect Antoni Rovira i Trias. It is laid out in an x shape and takes up an entire block in the city, making this building one of the most characteristic markets in Barcelona.
At first is was solely a food market, but in 1931 there were stalls added that sold books, it was in 1936 that the market united with the entire "Mercado de Libros de Ocasión", or the Second Hand Book Market in English.
The building began undergoing a state of renovation, so the market stalls were moved to the adjacent street Ronda Sant Antoni and it's unclear about the future of the original structure, as during the renovation, workers found what appear to be remains of roman ruins.
The market is open from Monday to Friday, and has a series of stalls dedicated to food an textiles, as well as a variety of tapas bars. On Sundays, the market is expanded with the inclusion of stalls that sell books, magazines, videogames, and more. This Sunday market is known as one of the best places in Barcelona to buy antique literature and collectibles. It's known as the Sant Antoni Sunday Market and it's well worth a visit!