The former government palace is now hosting a museum dedicated to Oaxaca and its history. Worth peeking in at least for the beautiful murals.
Official website http://museodelpalacio.blogspot.com/
Facenook https://www.facebook.com/mupaloax
Phone +52 951 501 1662
Address Plaza de la Constitucion, Centro Historico, 68000 Oaxaca, Mexico
Coordinates 17°3'36.104" N -96°43'33.081" E