The sanctuary of Hera, the goddess's claimed birthplace, sits on a coastal plain about a kilometre from the village of Ireo, on the south coast of the island. In its prime in the sixth century BC the main temple was the largest in the Greek world, 108 by 55 metres in plan with 155 columns. Today exactly one stands upright — and only to half its height — but the field of fallen drums, walls, altars, and a small Roman basilica is laid out plainly enough that you can trace what was there.
The site is UNESCO-listed together with Pythagoreio. It is at its best in late afternoon when the light comes in low and the bus tours have gone. Bring water; there is no cafe within walking distance, just the sea and the airport on the far side of the runway.