Abo Elementary School had a concrete slab roof that doubled as the school's playground.
Notes on verification
Multiple independent authoritative sources including the National Park Service confirm the specific architectural details. The sources are diverse (government, travel, historical blogs) and contain consistent information about the concrete slab roof serving as a playground. The 1962 completion date and Artesia, New Mexico location are consistently verified.
Sources
- Abo Elementary School (wikipedia)
- https://www.nps.gov/places/abo_school-nm.htm (corroboration)
- https://virtualglobetrotting.com/map/abo-elementary-school-located-entirely-underground/view/google/ (corroboration)
- https://maps.roadtrippers.com/us/artesia-nm/points-of-interest/abo-elementary-school-and-fallout-shelter-artesia (corroboration)
- https://wikimapia.org/18362/Abo-Elementary-School-The-Underground-School (corroboration)
- http://atomic-skies.blogspot.com/2013/07/the-abo-school.html (corroboration)