Photo: Wikimedia CommonsEvery Saturday from spring to Christmas, the little square at Amaldus Nielsens plass in Frogner fills with Oslo oldest and best-loved flea market. Around a hundred stalls spill over with vinyl, vintage clothing, silver, porcelain, books and genuine antiques, and the browsing is half the fun. Bring cash and a keen eye, arrive early for the best pickings, and combine it with a stroll to the nearby Vigeland sculpture park just up the road.