Smithsonian Museum of Natural History
This museum is one of the few in the world that is open every day of the year except December 25. It is also the third most visited museum on the planet. Established in 1910, this building encompasses what the Smithsonian was originally intended to be - an organization dedicated to the sciences. The size and scope of the collection is incredible and priceless. The largest blue diamond in the world, fossils, geological treasures, prehistoric human artifacts, and, of course, the signature whale hanging from the ceiling - a history of the world that dates back millions of years awaits you.