Ben Thanh market is an enormous building—it takes up an entire city block. The market's selection isn’t nearly as impressive as the Chatuchak Weekend Market in Bangkok, though. At night (starting around 6PM), sellers begin to set up booths on the streets outside the building, and the interior closes at 7.
Helsinki's famous Market Hall opened its doors in 1889. Merchants here sell mostly food: fish, pastries, fruits and vegetables, and coffee and tea. It's worth stopping by for the history and for a snack.