Not-to-be-missed side trip away from the casinos in Las Vegas.  

The National Atomic Testing Museum is perfect for all ages, although small children might be scared by the Ground Zero theatre.  This is what a museum should be -- filled with fun (and properly functioning) interactive displays that your family will love. 

Address:  755 East Flamingo Road (short walk from Terrible's Casino)
Hours:  Mon-Sat 10 am - 5 pm, Sunday 12 pm - 5 pm (Closed Major Holidays)
Website:  http://www.atomictestingmuseum.org
Phone:  (702) 794-5161
Museum Store:

 Open 7 days a week during museum hours (702) 794-5150

Must-Sees:  Ground Zero Theatre (Warning: First part of film has scary sounds); Timelines of historical events including the overlay of non-scientific events like the date Elvis died.
Historical Signifigance:  Chronicles the geo-political struggle of the Cold War with the Soviet Union; establishment of Nevada Test Site; today's more balanced views towards atomic weapons and their effects on the environment
Photography:  Photography is permitted inside the museum although special exhibits may have some restrictions.
Photography Buffs: Check out the "Discovery and Innovation" Gallery.  Save some time for the touch screen interactive displays.  You won't be disappointed.
Children:  Children will love the well designed interactive and educational touch screen displays.  In particular, they'll love checking various household materials for radiation with a Geiger Counter by listening for the characteristic "beeping. 
  Tips:
  1. Buy a vintage postcard in the store and mail it to yourself as a souvenir. 
  2. Take a picture of your spouse with a cardboard stand-up of Miss Atomic Bomb.
  3. Buy an historical copy of a letter written by the late Albert Einstein dated 1939, in which he lauds the increasing importance of uranium, in particular, to the making of bombs.