THE UNDERGROUND
The Underground is literally underground. This River North bar boasts two rooms with two different types of atmospheres: one low-key and lounge-like, the other one high energy. With a good crowd, good music, and friendly staff, it's definitely worth hitting up this hot spot. To avoid a cover charge and guaranteed entrance to this exclusive establishment, make sure to arrive before 11 PM. Bonus: Around 1 AM they pass out free freshly baked cookies to everyone. Yup.
[Photos via @undergroundchi]