Known around the Bay Area as “The Rock,” Alcatraz is a former state penitentiary located on a small island visible from most hilltops around the bay. During its operational years, Alcatraz contained the country’s most notorious criminals like Al “Scarface” Capone.

In addition to the jail, there are several old military buildings and evidence of the rebellious American Indian occupation of 1969. If touring the halls of this prison doesn’t seem scary enough, check out the seasonally-available nighttime tours