Which Philly 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: Which building in Philly has the most beautiful interiors?

We all know that Philly’s architecture is diverse, ranging from Georgian- and Federal-style to Art Deco to modern. Yet while the city’s landmarked architecture so often focuses on the exterior of these buildings, as the saying goes, it’s what’s on the inside that counts.

So for this week’s open thread, we want to know, dear Curbed readers: Which buildings in Philadelphia have the most beautiful interiors?

Are you stunned by the galleries in the Pennsylvania Academy of the Fine Arts? Do the sweeping staircases in City Hall make you dizzy with delight? Or perhaps the midcentury modern interiors of the Rohm and Haas building make you swoon.

Tell us which buildings have the best interiors in the comments below, and feel free to share photos if you have ‘em. We’ll compile the best of the best in a forthcoming article!