This unusual building is known from various sculptured stones
found in the excavations that took place for the building of the
Pump Room in 1790. A facade with carvings of the four seasons
was surmounted by a decorated pediment containing an image of the
goddess Luna. This facade probably looked south towards the
entrance of the Spring over the doorway of which was a carving of
the Sun god Sol. In this way the deities of the sun and moon
opposed each other across the Temple courtyard and looked down
upon the great central altar.
The purpose of the building is unclear, but one interesting
suggestion is that it may have been a place where worshippers might
spend the night in the sacred courtyard in close proximity to
the Temple of the goddess. Here they might have visions in their
dreams.
Reconstruction of the stones of the Four Seasons
facade