Vredeberg museum is one of tourist attractions in Yogyakarta. It is used to be a fort in Dutch colonialism era. Now it became a musem about Indonesia’s indepence movement especially the one that happened in Yogyakarta.
They also have a coffee shop called “Indische Koffie” if you want to relaxing after going around the museum. Just to feel the Indische feeling.
Vredeburg is definitely a must visit if you’re a big fan of historical stuff.