Such a gem if you can make it out to east San Diego, I would strongly encourage you too. Not busy at all, plenty to see and great hosts/docents who will answer any questions and happily guide you...
San Diego Air & Space Museum Gillespie Field Annex
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The San Diego Air & Space Museum Gillespie Field Annex in El Cajon, CA, serves as a dynamic hub for aviation and space history, featuring an extensive collection of aircraft, spacecraft, and artifacts. This museum provides enriching educational experiences through programs, exhibits, and archival resources, fostering a deeper understanding of aerospace technology and its impact on society.
With a mission to collect, preserve, and make accessible a wealth of aviation and space-related materials, the museum's Library Archives boasts one of the largest collections of its kind in the country. It caters to a diverse audience, including researchers, students, and aviation enthusiasts, offering an array of resources to explore the rich heritage of air and space exploration.
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Reviews

I am always energized by Museum Month in San Diego. Whoops, the Gillespie Field Annex does not honor Museum Month. So, I paid the $10 fee. A very chatty docent offered me a tour of the normally...

This is the 'Annex', or smaller Gillespie Field offshoot of the larger Air & Space Museum in Balboa Park (Downtown San Diego). This one is located in El Cajon and is much smaller. If you're a...

Awesome experience, took my wife here more as "emotional support" since this was more for me, but even she enjoyed it. Lots of aircraft as well as interactive experiences. Plethora of old war...

My family has been going to this museum for over a year now and we love every bit of it. This time around, we decided to have our son's 4 year old birthday party there. It was a success! Carlos...