The Siphnian Treasury is a monumental building from the Archaic period of ancient Greece, located at Delphi and built around 525 BCE. This treasury was constructed by the islanders of Siphnos to celebrate their wealth from successful mining and to house valuable offerings to the god Apollo. It serves as an important example of the architectural style and decorative arts of the time, showcasing intricate sculptures and reliefs that reflect both religious devotion and civic pride.