The Religious Triangle was made up of four towns in the north of the region of Galilee: Gennesarat, Capernaum, Chorazin, Bethsaida. The Pharisees were a strong and dominant force here.
Tiberias was the capital city of the kingdom of Herod Antipas, son of Herod the Great. Because this city was built by Herod Antipas, it was a stronghold of Herodian influence and worldview.
Gamla was a Zealot stronghold in the region of Galilee. It was the location of one of the final stands of the Zealots in their final days as a group.
Hippos was one of the northern-most cities of the Decapolis, the ten cities built by Alexander the Great to celebrate the greatness of Hellenism. This pagan city would never have been willingly visited by any Jewish person.