National Mall and Memorial Parks in Washington, D.C.
Though this urban park is a photo-ready landmark year-round, go in the spring to see the cherry blossoms in pale-pink bloom around the Tidal Basin. (The trees typically bloom for most of April, but make sure your trip doesn’t coincide with the National Cherry Blossom Festival weekend, when the area is overrun with tourists). Visit the newer Martin Luther King, Jr. Memorial and the World War II National Memorial, as well as classics like the Lincoln and Jefferson Memorials and the Washington Monument.
Acadia National Park in Maine
Take in the rugged coastal area of Mount Desert Island, the picturesque Schoodic Peninsula on the mainland, and the spectacular cliffs of Isle au Haut. Go in autumn for easy access to camping spots and some of the most vibrant fall foliage in the country.