Which Boston buildings have the most beautiful interiors?

From the federal style big in the 18th century to more modern fare, buildings in the Boston area brim with aesthetically awesome exteriors.

But what about the interiors?

Our latest Friday Open Thread seeks to answer that question: Which buildings in the Boston area have the most beautiful interiors and why?

There are probably some obvious favorites, such as the McKim building of the Boston Public Library or Trinity Church nearby. The interior of the State House certainly has its charm.

Perhaps, though, there are some dark horse candidates—maybe buildings that look like blech on the outside but really sing on the inside. Or more contemporary piles that look nothing more than functional until the interior reveals a grander vision.

Sound off in the comments section below.

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