There is no photo library but pictures are still visible in Photos app I learnt that by default the Photos app maintains a photo library within the pictures folder of my user account on my MacBook Pro. However, there is no such library in the pictures folder. I have searched thoroughly, but cannot find it in any other location either! Even so, my Photos app still displays my photos. 

What could be the reason for this? Where's my Photos Library?
The default location for the photo library is ~/Pictures/, but it's possible that it's different for you. Open the Photos app, open the Preferences pane and the General tab will show you the location of your photo library.