In Photos for OS X, you can create folders to organize your albums in. You can create folders inside of folders, too. This seems obvious, since of course when managing tons of photos, you're going to want some deep level of organization. And since Photos syncs to iOS, and those folders synced as well, I figured there had to be a way to make folders directly on iOS. And there is! Just tap and hold for a second on the + button that you'd normally quickly tap on to create an Album, and sure enough, a sheet slides up offering to make a New Album or a New Folder.

Tap and hold for a second on the + symbol (1) to get the sheet to slide up with New Album and New Folder (2) options

Once you've created a new folder, you can create new albums in it. What I haven't yet figured out is how to move existing albums into those folders. If anyone finds a way, please let me know in the comments. 

Here's a folder with a bunch of albums in it…

This folder has nine albums inside it

And here's the content of the folder. I like that you can view all the images at once, or the individual albums.

You can view all images at once, or the individual albums

Have you found any other hidden tricks in Photos in the iOS 8.3 update?