2455 Old Penitentiary Road

Boise, ID 83712 (Next to the Old Pen)

Current Hours

IMMG has now closed for the Season. Check back in Spring for the latest plan to open for 2021.

Free Admission!

Tours and other programs available.

Field Trips

Sadly, because of the pandemic, we are unable to offer field trips in 2020. We know that these are one of the most popular offerings of IMMG, but it has not been possible to arrange leaders and trips in the uncertainty of virus restrictions and public concerns about group activities.