Arguably one of the best preserved monuments of the ancient world, the temple of Apollo within the sanctuary of Bassai has been designated as a Unesco World Heritage site.
Evidence suggests that the temple was built to honour Epicurius Apollo for saving the town from the plague. Some stipulate it was designed by the Iktinos, the same architect who designed the Acropolis in Athens. This temple is important because it is almost complete, combining three different architectural styles (Corinthian, Doric and Ionic).