If you're looking for amazing Washington DC sightseeing opportunities, you need look no further than your wallet. On each penny, 5-, 10-, and 20-dollar bill, you'll find one of the many epic ancient Greek- and Roman-inspired sights that DC has to offer. To start, you can admire the tall columns of the Lincoln Memorial or imagine what your first executive order would be while observing the White House's facade. But the list of things to do in DC isn't complete without a trip to the Smithsonian. This massive complex consists of more than 19 galleries and museums in DC, including the National Museum of Natural History and the Air and Space Museum. Among its world renowned exhibits are the Hope Diamond and the giant pandas that live in the National Zoo.