Of particular value are the exhibits documenting the Indonesian battle for independence which saw the Dutch withdraw and Indonesia successfully claim independence.
Of course these exhibits and dioramas are highly patriotic and paint a glorified picture of what took place, but are interesting nonetheless.
Other exhibits related to previous Javan kingdoms are noteworthy and of some value to those interested in such things.
Getting to Rangga Warsita is relatively straightforward when using an angkot from either Lawang Sewu or Simpang Lima. Simply catch any angkot heading east along Jalan Pandaran which then turns into Jalan Jenderal Sudirman, but mention to the driver you are heading to Rangga Warsita to ensure you are dropped off in the correct location. The fare should be 3,000 rupiah.