Tower of the Winds

The Tower of the Winds or the Horologion of Andronikos Kyrrhestes is an octagonal Pentelic marble clocktower in the Roman Agora in Athens that functioned as a horologion or "timepiece". It is considered the world's first meteorological station.

Unofficially, the monument is also called Aerides, which means Winds. The structure features a combination of sundials, a water clock, and a wind vane. It was designed by Andronicus of Cyrrhus around 50 BC, but according to other sources, might have been constructed in the 2nd century BC before the rest of the forum.

In antiquity it was topped by a weather vane-like Triton that indicated the wind direction.In its interior, time was determined by a water clock, driven by water coming down from the Acropolis.