If it's been awhile since you've taken a museum road-trip to Chicago, and you love to save money, some Chicago museums have quite a deal for you.

That deal has an expiration date, though. You'll want to make that trip before the end of September.

Here's what they have going on:

The Field Museum is offering basic admission for free to all Illinois residents. A Discovery Pass is required to see a ticketed exhibit or a 3D movie.

The Museum of Science and Industry is offering free admission for Illinois residents on Sundays in September, plus a free ticket to The Science Behind Pixar exhibit when reserving tickets online.

The Shedd Aquarium is offering free general admission for all Illinois residents from September 4th - 30th.

Adler Planetarium is offering free general admission for all Illinois residents from September 9th - 16th, which includes all exhibits except the sky shows, which are $5 per person.

The Art Institute of Chicago is offering free general admission for all Illinois residents from 5-8 p.m. every Thursday. Kids under 14 are always free.

The Peggy Notebaert Nature Museum is offering free general admission for all Illinois residents every Thursday.