The Boqueria Market in Barcelona is the most spectacular such market I've ever seen. It is immense and lively and colorful, brimming with fresh produce, fish, meat, spices, confections, pastries, and copious amounts of other specialties of the region. If you can eat it or drink it, and it was made locally, you'll find it there. My sketches only give tiny peeks, including this large EEL, (in Catalan,'el congrio'), dominating a fishmonger's stall, into the cornucopia that is Boqueria. For more info click on this link.
The mammoth in the bottom sketch (click for bigger) was my plan B for the day. I'd intended to sketch the large fountain at Parc de la Ciutadella, but when I got there, I found it covered in scaffolding. I used a new orange pen I found at an art supply store in the old town----it's not my fave, as it turns out. (It helps to blame your art supplies when things go awry while sketching.)