Learning by Projects

I am a self-motivated learner in my thirties, and not in any formal school.

I am very interested in learning mathematics and engineering through a series of projects, and learning the (math and engineering) tools I need to complete each project as I need them. I am hoping someone might direct me to projects I can use to educate myself. Ideally, when math is needed, the project would point me in the right direction, so I could look up the math I need to know online or in books. And the same for engineering.

What projects would you recommend for learning?

As for my starting point, I am a high school graduate, though it has been many years since then. I have not had any useful college education. I always enjoyed science in high school and excelled at understanding the principles being taught, but found math boring, mostly due to my inability to use what was taught in anything else.