For romance, View Boston (Prudential Tower) is hit or miss.
The best single panorama in the city — from roughly 750 feet you read the whole peninsula at once: the Back Bay grid laid out like a circuit board, the Charles curling toward Cambridge, the harbor islands beyond. The 2023 rebuild added a glassed-in cloud-level lounge, a 3D scale model of the city, and an open-air roof deck, so it's more of a sit-and-linger hour than the old quick elevator-up, elevator-down. The catch: at ~$36 it's a pricey peek that goes flat on a hazy or gray day, and once you've taken the photos there's little to actually do up there.