A lava-rock obelisk marks ground zero of the July 16, 1945 Trinity test, the world's first detonation of a nuclear weapon. Public access is extremely limited; in 2026 the announced open house is October 17.
Filed under weird history: real events too strange to have made the textbook.
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Source: home.army.mil/wsmr/index.php/contact/public-affairs-office/trinity-site-open-house