Which Detroit buildings have the most beautiful interiors?

Welcome to Friday Open Threads, wherein we'll pass the mic to readers to speak up about topics of interest, distress, horror, and more. This week’s topic: It’s what’s inside that counts.

We know that Detroit has a range of architecture styles, from Art Deco gems that were built during the heyday of automobile manufacturing to the simple midcentury beauty of Minoru Yamasaki’s designs.

So much is focused on the exterior of the buildings. Today we want to know, Curbed readers: Which building has the most beautiful interior?

Is it the colorful Guardian Building? Perhaps the intricate murals and atrium of Rivera Court at the Detroit Institute of Arts? Maybe you’re drawn to the serenity of the McGregor Conference Center?

Is there a building that’s kind of ugly on the outside, but beauty lies within? Maybe a favorite restaurant or theater? An old classic or perhaps a newer renovation?

Let us know in the comments. If you have a photo, feel free to share. Your suggestions may soon end up on a map.