Feira da Ladra
Time Out says
This is the Lisbon equivalent to Madrid’s El Rastro or London’s Portobello Market. Feira da Ladra started in the 13th century and moved around town, from São Jorge Castle to Rossio through Campo de Santana, before setting up camp at its current Campo de Santa Clara location in 1903. Get there early to snatch the best deals on new or second-hand objects. With clothes, books, vinyls and antiques, there’s a bit of everything.