The nation's capital boasts a wealth of monuments, memorials, and museums. That abundance can be overwhelming—but Washington DC tours offer an easier way to see the best of the city. Enjoy a flexible sightseeing experience when you travel by hop-on hop-off bus or trolley, or explore by night to beat the crowds and see landmarks from the Lincoln Memorial to the White House lit up after dark. Then, dig deeper: Whether you visit the US Capitol, explore Smithsonian highlights like the Air and Space Museum, or pay tribute at Arlington National Cemetery, it's worth stopping for a closer look.