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WHITE SANDS MISSILE RANGE, N.M. (AP) — Military officials in southern New Mexico are preparing to host visitors at the spot of the world’s first atomic test during a special one-day open house at the Trinity Site.

The first of two annual open houses will be April 7.

At the site on White Sands Missile Range, visitors can take a quarter-mile walk to ground zero where a small obelisk marks the spot of detonation. Historical photos are mounted on the fence surrounding the area.

Visitors can also tour the Schmidt/McDonald Ranch House, where scientists assembled the bomb’s plutonium core.

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Last July marked the 70th year anniversary of the test at the Trinity Site. It was part of the Manhattan Project, a top-secret World War II nuclear development program out of the then-secret city of Los Alamos.