Waste to Wonder Park is a quirky theme park near Sarai Kale Khan where scrap metal has been turned into replicas of the Eiffel Tower, Colosseum, Taj Mahal, and other famous monuments. It is not one of Delhi's deep historic sights, but it is fun with children, easy to combine with nearby Nizamuddin or Humayun's Tomb, and best after dark when the recycled landmarks are lit.