1. Washington, D.C.
One of America’s most beautiful cities, stately Washington, D.C. just keeps getting better. The National Mall is truly majestic, with the Capitol building glowing at one end, the Lincoln Memorial at the other. For an efficient way to see them all, book a pedicab tour with Adventure DC Tricycle Tours. Beyond politics, monuments and museums, D.C. boats some cool, emerging neighborhoods like the Wharf (eat at Officina or Del Mar de Fabio Trabocchi) and Southeast, where the Nationals play baseball and craft beer rules at Bluejacket nearby. If you're looking for a historic and centrally located place to stay, book a night at the Willard Intercontinental, just steps from the White House.
Why go: You could spend weeks exploring the Smithsonian museums lining each side of the National Mall and not see it all. Take a look at our list of the best museums in D.C. for a start, but plan to spend extra time at the new(ish) National Museum of African American History & Culture.