According to Wikipedia, the Wedding Cake House in Kennebunk is the most photographed home in Maine. Judging by the insane amount of photos on the #weddingcakehouse hashtag on Instagram, I'd say that title is accurate.

MaineMemory.net, Vickery-Shettleworth Collection of Early Maine Photography

According to MaineMemory.net, the George W. Bourne House was built in 1826. The elaborate embellishments were added in 1855. After that, it was known as the Wedding Cake House.