This is a gate in one of old building in the heart of Kota Jogja. Taman Sari Water Castle is the name.
Taman Sari Water Castle, also known as Taman Sari, is the site of a former royal garden of the Sultanate of Yogyakarta. It is located about 2 km south within the grounds of the Kraton, Yogyakarta. .... more open Wikipedia.
This is red turi, kembang turi merah (Sesbania grandiflora).
Lirik lagu Turi Putih