This was the best museum Ive ever been to, even though I have absolutely zero interest in planes or spaceships... That shows what an incredible museum it is. It is in two different buildings, I highly recommend both, the one in DC is probably the one you should start with......I've seen people say you can see it in a half-day but that's not true, in total I've been here about 12 times and each visit was a full day visit and you really need a full day to even scratch the surface.You will see the discovery space shuttle, an Amelia Airheart plane, the Moon Lander, the Apollo 13, the spirit of St. Louis, the French Concorde, you get to touch a Moonrock, and best of all they literally have the Wright brothers plane. This is the first airplane that ever flew!!!!!!I was so fascinated and transfixed I walked around it in a circle for about half an hour and read all the intricate detailed information possible, and then I just stood back to appreciate it, and I was standing beside a security guard... For 15 minutes the only question he answered from various tourists was "Is this a model? This is a model right, this can't be the real thing! ".....And his answer each time was the same "No -this is the real thing. This is the original Wright brothers plane. " It was fascinating. There are also spectacular massive stunning color photographs of constellations and nebulas from around the universe taken by the Hubble. Probably the best experience I've ever had with any museum docent in the world happened when I was at the location in Virginia, which is much bigger. Whenever I go anywhere, including restaurants or hotels or cities or museums I like to research ahead of time what are the best things to look for. Therefore before I arrived at the museum I looked for the 10 things that are a must do. I found the first nine things myself and they were just incredible... The only thing I could not find was something called the Japanese Balloon Bomb. I went up to an info booth and asked a nice gentleman staff for directions, expecting he would just point me the right way. Instead he immediately stood up and literally was tripping over himself to leave the desk, and he left a note saying back in 10 minutes, and he said oh my gosh that's so exciting I've worked here 20 years and never has anybody ever asked me where is the balloon bomb, how did you know to ask about the balloon bomb, nobody ever asks, they're always looking in the wrong direction and they walk right past it... The four of us followed him like the Pied Piper right over to it and he explained the whole history, it was fascinating. In World War II the Japanese ingeniously engineered 9000 balloon bombs, which were inflated to about 30 feet tall, and made of rubber or even paper, they were released into the air and caught the jetstream across the Atlantic towards USA.....They were so brilliantly designed that they had sand in bags tied in a circle around the bomb that acted as ballast... Therefore if the balloon was found to be floating a bit too low somehow the technology would drop a few sand bags until the balloon was lighter and would rise up higher- That is not bad for 73 year old technology long before computers are available....... about 1000 bombs landed on American soil that only caused six deaths, when one of them landed on a kindergarten class on a field trip and exploded. During the war obviously Americans were shocked and confused by these bombs landing on there- obviously they didn't know where they were coming from because the Japanese didn't leave any signs, ie "from Japan with love! " Etc. Therefore the greatest geologists in the country did in-depth studies of the sand in the bags and found after testing that there is only one possible beach in the world where that sand could have come from and it was in Japan near Nagasaki. Fascinating. I'll never forget how shocked I was after the first time I saw this museum, I immediately drove back to my spectacular hotel in Georgetown the Four Seasons Hotel which is on Pennsylvania Avenue the same street as the White House... And I asked the concierge, how is it possible that I just saw the best museum in the world and yet it was free? He said "those are your tax dollars at work! " I replied " Not my tax dollars! I am Canadian!" Thank you to the American tax payer !!! read more