Jalan Ahmad Jazuli, Indonesia
Phone: 62 274 520225
Taman Sari, Jl. Taman, Kraton. Also known by the Dutch name waterkasteel water castle, this is a partly ruined complex built as a pleasure garden by the first Sultan in 1765. One of the bathing pools was dedicated to the sultan's harem, and he had a tower overlooking the area so he could take his pick. Towards the back of the complex is the original entrance to the pools, which used to be a small dock connected to a long-since-vanished river; a bit of snooping beyond this entrance will get you to a back street, where one can freely visit a fascinating network of tunnels and rooms, including an Escher like series of interlacing staircases over what looks like a disused well. Entrance fee does not cover the guide, who will expect tips.