I’d never been to the Twin Cities before, probably because in my prior nine transcontinental drives, I’d usually been in a hurry, and they’re just far enough away from I-90 that they got missed. Really nice neighborhoods, a good transit system, big but not overwhelming downtowns, and a lot of individual architecture worth seeing.
The Walker Art Center had always been on my list of museums to visit, and it has a very strong permanent collection, mainly in 20th Century American work. Ed Barnes did the original building in the 70s, and Herzog and de Meuron completed a very successful renovation / addition.

the sculpture garden at the Walker had most of the sculpture removed, but the spaces were just fine without it
Siah Armajani has been one of my favorite sculptors for three decades. I finally got to see his largest installation, the bridge in the Walker sculpture garden that extends over a big arterial and an interstate.
The IDS Center, by Philip Johnson, was innovative with its public atrium when it was built in 1972, and it holds up very well.

the court intersects with the skybridge system really well – making the skybridge part of the spatial experience, rather than just tunnels and gerbil tubes on the second floor.
Lots of other buildings to see.

the downtown library, by Cesar Pelli. The linear atrium has clerestory windows which bounce light in off the big wedge floating above.

the Foshay Tower, one of the early skyscrapers I’ve seen that doesn’t follow either the Chicago slab or the NY base-and-tower approach.