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The Roman Agora was built as an extension to the Ancient Agora in the 1st century BC. This marketplace contained a courtyard, shops, storerooms and stoas. Not to be missed is the Tower of the Winds, an octagonal marble tower which served as a water clock, compass, sundial, weather vane and water clock. On each of its eight sides is a depiction of a directional wind. There is also a relatively intact 15th century mosque north of the agora along with the Gate of Athena Archegetis. Visit the museum of Greek Popular Musical Instruments (URL) literally down the street. Walk back towards Monastiraki metro station and view Hadrian's Library. Closest metro: Monastiraki. For a flavor of Greek island architecture, walk up to Anafiotika.