A High School in a suburb of Delphi City on Caprica.
It survived the Cylon nuclear holocaust remarkably well and became a base of operations for the anti-Cylon resistance movement led by Samuel Anders. Over 100 people at one time lived and operated out of the bombed out High School and it provided good cover from the Cylons, who never once attacked it. For recreational purposes, Anders and his teammates from the Caprica Buccaneers constructed a make-shift Pyramid court in the school's courtyard for anyone who wished to use it ("Resistance").
According to Anders, the Cylons had found this location and attacked the base, killing half his men. It is unknown wheter or not the school had survived the assault. ("Lay Down Your Burdens, Part I")
Notes
According to a deleted scene aired in the recap at the beginning of the episode "Scar", it is located 300 klicks north of the only Cylon airbase in the area; presumably this means the airbase in Delphi itself that Helo and Caprica-Sharon tried to infiltrate in the episode "Colonial Day".