There is no curfew in Arrakeen or Carthag, due to practicality considerations. The cooler temperatures at night mean that the evenings can be very busy
Wind trap with a vast reservoir of water in a small rock formation
The last known whereabouts of Dmitri Kudu, the previous Harkonnen second-in-command. The villagers were tortured for information regarding Kudu, then executed. The buildings have largely collapsed due to lack of maintenance.