Visited both the Kiek in de Kok and the Bastion Passages in July 2013. The passages were awesome! Went on a tour of them and learned quite a bit about the history of the city. There was a "train ride" at the end of the tour; this seemed to be a bit of a waste of time. The Kiek in de Kok was okay; you climb up toward the top, see a few displays and can look out over some parts of the city.