Black Forest must sees

"along the way"...

You have a choice of routings. The two fastest routings, according to https://www.viamichelin.com/ , will take you through very different places. Since both routes already require 4.3 hours behind the wheel, you probably aren't looking for lengthy detours from your route of choice. You can find driving routes and attractions ON the available routes by using the linked site above... After your route map pops up, scroll down to "Activate Services" and click on the green box on the right side with the castle icon and the word "travel." The sights will appear on your route map, and you can then choose what interests you.

Consider stopping at the Bodensee (Also known as Lake Constance).

Some of my favorite places in the Black Forest are Titisee and Triberg.

Maybe Ulm?

Ulm?

be sure to look up

The Ulm cathedral is impressive! Tallest church in the world. It has cool modernist stained glass too.

Not even close to the Black Forest though.

I thought it was stops along the way suggestions too. Hence Ulm.

Mchpp you are indeed correct!