What is the most beautiful building in Boston?

There is a ton of new construction in Boston, some of it so grand and/or ambitious in scope that it’s a foregone conclusion that future generations will gaze upon it and pronounce strong opinions.

What of the buildings already here, though? What about them? Our latest Friday Open Thread wants to know which building you think is the most beautiful in Boston and why.

By the way, we’ve already asked which is the ugliest—and you didn’t hold back. Sound off on the other end of the aesthetic spectrum in the comments below.

• Newer Boston addresses people will hail 50 years from now [Curbed Boston]
• What is the ugliest building in Boston—besides City Hall? [Curbed Boston]