Athens. Greece. View of the partly restored Propylon or monumental entrance of Roman Emperor Hadrian’s lavish Library built in 131 AD in Athens. The Propylon consisted of four Corinthian columns and flanking it was an imposing Pentelic marble façade adorned on each wing by seven unfluted Corinthian columns. The library complex consisted of a vast library, a large courtyard with a garden and central pool, mosaics floors, numerous rooms and a facade adorned with Corinthian columns.