In Yogyakarta, Indonesia there is an interesting structure called the Water Castle or Tamansari. Formerly Tamansari was a recreation garden or a resting house for the Sultan and family. The other function is it was used as hiding place for the royal family to defend against the enemy assault.
Tamansari is located about 2 km south of Yogyakarta Palace and built by a Portuguese architect in European aquatic construction adorned with Javanese symbols and ornaments. Tamansari was built in the Sultan Hamengku Buwono I period in the end of XVII Century. Tamansari comprises a compound of bathing pools, canals, rooms and an extremely large swimming pool.