Said to have been introduced by traders from the court of Kublai Khan, these cantilevered nets, set up on teak and bamboo poles, are physical remnants of Fort Kochi's ancient trade with the Far East. Fishermen work the nets all day long, lowering them into the water and then hauling them up using a remarkably efficient pulley system. The best place to watch them at work is from Vasco da Gama Square or from a boat at sunset. Nearby, the Indo-European Bastion Bungalow (now the official residence of the Sub Collector) dates back to 1667; built on the site of the old Dutch Fort's Stromberg Bastion, it is believed to stand above a network of secret tunnels.