Final project for advanced digital photo

With the help of my classmates I settled on the idea of arches for my final project. Architecture photography is not something I'm especially drawn to (and I don't have the best lens for it) but arches showed up a lot in my mosque/museum photos from Turkey, and Boston has a lot of old buildings with gorgeous arches so the idea allowed me to continue to shoot while being able to use my Istanbul photos. Some of them are really obvious, but see if you can determine which ones were shot in Boston vs. Istanbul...