The library of Celsus was reconstructed in the end of the last century, Built in 135 AD it held 12.000 scrolls, it was destroyed in 262. The front is great (elsewhere on the web you rightly find the advise to visit it early in the morning, when light shines on it). As it is one of the best sights in Efes I took many pictures of it. Celsus had been "proconsul" of the province of Asia, effectively governor of that province. He had done well, and the library was a monument, and actually his mausoleum. For his son managed to have him buried within the library (ordinary dead were never buried within the city walls), where his sarcophagus remained untouched until it was dug up in 1904.