On a platform at the foot of the Kronos hill, a row of eleven treasuries formed the northern boundary of the sacred domain. They were built in the sixth century BC, by eleven Greek cities. Only two of them were in the Peloponnesos (Megara, Sikyon), the others are colonies, such as Byzantium, Cyrene and Epidamnos. Five were from South-Italy and Sicily (Gela, Metapontion, Sybaris, Selinous and Syracuse).
The miniature buildings consist of a single room preceded by a small entrance-hall with two columns, like a small temple. Under the protection of the god, they housed valuable votive offerings, some of it war booty, but also money, which could be withdrawn by the cities in case of need.
The best preserved and largest treasury is that of Sikyon, which has been partially restored on the site. Pausanias gives a description of its contents. The treasury of Syracuse, one of the most recent, was built to celebrate the victory against Carthago in 480 BC in the battle of Himera, which took place in the same year as the battle of Salamis.