This spot isn't really hidden, but it is unique, and so I wanted to mention it regardless.

A few other speakeasy lists for Chicago mention it, but my friend Frankie Greco recently visited and didn't think it made the cut.

They host funky live music, as you can see by the attached image, and it's generally a popular place with a half-dive aesthetic.

At night though, it turns into a dance club. In Frankie's experience, it's rare that it's not absolutely packed to the gills at night, which isn't my preferred style, but if it's yours, have at it.

Their back patio, however, is much chiller on the hyped up popular nights, and sometimes they set up a juicer stand to make fresh boozy apple drinks, which is quite nice.

Good funky clubs are hard to come by, so I do recommend it, but do beware you're getting yourself into quite the party.

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Their website is: http://www.whistlerchicago.com/