I made a bunch of bookmarks and now I can't find them. It seems the only way to access them is by opening their files one-by-one, then looking for them. How can I get all my bookmarks in the entire project in one view?
I'm running KDevelop 4.7.3 in Ubuntu 16.04.1 64-bit.

There's currently no way to do that, bookmarks are intended to be quick-jump locations inside a document.

What do you want to achieve? Maybe there's a different feature which provides functionality similar to what you need.

I'd like to be able to get back to all those places in the code that give insight to certain a database's structure, that will help me understand how to use it in a different project. But I don't see how I can do that now w/out going to every file and seeing if it has any bookmarks in it.

You can create a working set, maybe that helps? Open all the files you care about, then in the top-right corner click "Stash" on the icon to close them all; you can now open a different set of files and switch between them by clicking the icons.