Good "climbing" around Chicago?

The route below is the Beverly Bike - Veepak training/group ride. (as far as I know its the regular route).  I've been on the xXx Racing ride up through the north burbs and although there are some decent hills, little traffic, and an overall good route.  The roads there are of significantly worse quality and the hills are not quite as steep or as plentiful as in the Palos/Willow Springs area.

I've not cycled the world just yet, but around the Chicago area I've been up north - a good mix of slow rollers/hills... out south - flat FOREVER.... the city area - lakefront trail is fun and busy streets have a unique appeal, watch out for doors!!!!... the willow springs/palos area - so far my favorite, I've only been out there once but it was AMAZING!  The scenery, the hills, the road quality, excellent training - I can already feel myself getting stronger from rolling up the hills in my biggest gear (great strength training!).  Also I had my first trip to 40mph!  What an experience, so much wind, any small shift of the bike demands attention... absolutely in the moment looking out for anything that may ruin the otherwise incredible experience that is going 40mph on 23mm worth of tire :)

Next time 50mph... and faster up the hills... :)

Can't wait to do some solo routes.  There is also an area called swallow cliff which has many stairs which people run/walk up and down - I may ride to it and run up/down a few times myself... I had forgotten about that place but we passed in on the ride!

If your around Chicago, DEFINITELY study the Strava route below and use it to plan your own, tis some great riding.... and you might see me climbing up a hill or possibly flying down one!