Roman Agora Athens. Greece. The Tower of the Winds, an octagonal hydraulic clock tower built in the 2nd or 1st century BC.

- Image ID: D2XHB6

Roman Agora Athens. Greece. The Tower of the Winds, an octagonal hydraulic clock tower built in the 2nd or 1st century BC.

Sklifas Steven / Alamy Stock Photo

Image ID: D2XHB6