Haarlem is a city outside Amsterdam in the Netherlands' northwest. It retains its medieval appearance of cobblestone streets and gabled houses, as well as its cobblestone streets and gabled houses. It was once a major North Sea trading port surrounded by a defensive wall, and it retains its medieval character of cobblestone streets and gabled houses. It's known for its tulip fields, museums, and almshouses (courtyards) built around leafy trees