LOS ALAMOS, N.M. — Three historic sites in New Mexico connected to the development of the world's first atomic bomb will open for a science festival.

The Los Alamos Monitor reports the Manhattan Project National Historical Park's sites located "behind the fence" in Los Alamos will be made available to a small crowd next month during ScienceFest 2018.

The sites — Pond Cabin, Battleship Bunker and the Slotin Building — are on property managed by the Department of Energy and are currently off-limits to the public.

Los Alamos ScienceFest celebrates the history and science of Los Alamos.

Scientists working in the then-secret city of Los Alamos developed the atomic bomb as part of the World War II-era Manhattan Project. The bombs were later dropped on the Japanese cities of Hiroshima and Nagasaki.