Two other of Ephesus's outstanding monuments hold importance not just for their home city also for world's cultural and architectural heritage. The first one is the library of Celsus which is located at the end of the Curettes Street. The library looks like a two storeyed building seen from the facade but as we know it former had three stories inside. The facade shows a rare found craftsmanship. Also the library was the third biggest library of the ancient world, after the libraries of Alexandria and Pergamon. Anyone who stands in front of this monumental building can understand why did it take twenty years (115 AD to 135 AD) to complete it. 