Bassae (Latin) or Bassai, Vassai or Vasses (Greek, Modern: Βασσές, Ancient: Βασσαί) is an archaeological site at the southeastern end of the Ilia Prefecture that was a part of Arcadia in ancient times. Bassae lies south of Andritsaina, west of Megalopolis, east of Figaleia. It is famous for the well-preserved mid-5th century BC Temple of Apollo Epikourios (helper). The architect was the same Iktinos who constructed the Parthenon. Although this temple is remote and comparatively insignificant compared to others, it is one of the most studied ancient Greek temples because of its multitude of unusual features. Bassae was the first Greek site to be inscribed on the World Heritage List (1986).