This museum is an internationally recognized gem that we're lucky enough to have in Kansas City. Wander around inside the museum (a free excursion, aside from special, visiting collections) or, if it's nice enough outside, wander the grounds and see all of the outdoor art.
Not only is Union Station a rail hub with gorgeous architecture, but it also houses a variety of attractions and conveniences, such as restaurants, shops, a theater, and permanent and traveling exhibits. As an added bonus, Union Station is also a stop on the streetcar, which can easily take you to a few of the other places on this list!