Hadrian's Library is an architectural wonder with high surrounding walls and a columned facade. Although mostly in ruins, the site was once home to the largest library in Athens. It is located outside Monastiraki metro station, on the northern side of the Acropolis of Athen. Built by Roman Emperor Hadrian, the library complex used to store both important literary works and legal and administrative documents.
It is said that lectures and various philosophical and music schools were also held at the library. Severely damaged in an invasion, three churches were also built in the central courtyard of Hadrian's Library. Some elements of the churches, including portions of their mosaic flooring, are still visible. The west wall by the entrance has been restored, however, the 100 columns that once bordered the courtyard has been destroyed