On a budget, weigh it — Adler Planetarium isn't cheap for what it is.
$19–35 (free grounds)
The sky shows are solid and the museum is compact, but the real reason to come is the spot itself: the lawn behind Adler offers the postcard skyline-over-the-lake view that nowhere else gives you, for free. The catch is the indoor museum is the weakest of the three Museum Campus attractions on its own.