Every Sunday from 09:00 to 17:00 there is a huge flea-market. The market is a particularly interesting place in Colombia!
Wikipedia (Spanish) https://es.wikipedia.org/wiki/Parque_de_los_Periodistas
Address 16-62 Carrera 4, Bogotá, Colombia
Coordinates 4°36'4.622" N -74°4'9.84" E