After inventing geometry and physics, Greeks invented history—primarily as a way to document their many inventions. Take a stroll through history with today’s Groupon to the Oakland Aviation Museum. Choose between the following options:

• For $9, you get two adult admissions (an $18 value).
• For $30, you get a one-year family membership (a $60 value).
  
  

The Oakland Aviation Museum, housed in the historic Boeing School of Aeronautics hangar, introduces visitors to a stunning assortment of aircraft and artifacts. The permanent collection showcases a replica of the Wright brothers’ Model B Vin Fiz, the first aircraft to complete a transcontinental flight without latching on to a flock of birds. Fighter aircraft such as the Grumman F-14A Tomcat, a twin-engine jet once armed with sidewinder missiles and a 20mm Vulcan Gatling gun, reveal insider stories about the wars to which they were deployed. Visitors can also mosey over to an interactive exhibit that allows them to crawl inside various planes and peruse a mock control tower. Families that opt for an annual membership get one free tour for each person of the Solent MkIII, a seaplane that gained fame and Harrison Ford’s gratitude in Raiders of the Lost Ark. Members also enjoy year-round discounts at the museum’s store and a subscription to the quarterly museum newsletter “Chatter on the Flightline.” Events at the museum educate visitors on the science of flight and the tragic history of airline food.