A visit to a mysterious place

We paid a visit to Grandma Bonnie and Grandpa Larry this weekend. On Saturday we walked with them to an obscure Minneapolis location. Can you guess where we are?



I know, it's tricky.



Here's another hint.



Now, at this unnamed place (you didn't think I would give it away, did you?), they had a garden, and in the garden they had artichokes. Is this what happens to artichokes when you leave them out too long?



They don't look nearly as tasty that way.