The nearby Andromeda Galaxy has a supermassive one of these at its center
[DOC] [TLE] Black Holes: Supermassive Guardians of the Galaxies | College of ... [PAR] Jul 27, 2015 ... At least one of these behemoths is believed to occupy the center of ... 
Supermassive black holes have been spotted in several dozen nearby galaxies
including ....