If you like vintage objects you definitely want to visit Mercantic. This market is located in Sant Cugat, a popular town beyond Collserola hill next to Barcelona. Mercantic is both outdoor and indoor. As you walk in, there is a strip with 250 sellers with second hand items and artisans, primarily carpenters, exposing their manufactured products. You can find tables, chairs, lamps, cutlery, cristal glasses, clothing and all sorts of things. The indoor part is also quite big. There are shops of all sorts selling watches, vintage toys, jewels, straw made decoration items such as carpets, baskets, bags, furnitures and some great design shops including one specialised in letters lights.
Visiting markets can be fairly exhausting so if you want to take a break you can rest in the gastronomic section of the market. There are street food trucks selling Mexican food, vegetarian food, French food, etc. with an outdoor sit in area with tables and chairs. The most entertaining spot by far is the book bar El Siglo. This is a huge library, book shop and bar with a stage. Today there were 9 elements performing a great concert at noon! A huge cristal chandelier hanging from the roof made the atmosphere quite spectacular. You can grab a bite, have a drink, read and buy books and enjoy a fantastic concert (for free). Quite an experience!
Mercantic indoor shops are open from Tuesday to Saturday from 9:30 to 20:00 and on Sunday from 9:30 to 15:00. The vintage market is open only on Saturday and Sunday from 9:30 to 15:00.
San Cougat is about 15 km away from Barcelona and 45Km away from Sitges. You can easily get there from Barcelona with line S2 of Ferrocarril direction Sabadell and get off at Volpalleres station, then is a 5 minutes walk to the market.
For more information about Mercantic click this link: Mercantic