Every two years, the World Monuments Fund (W.M.F.) makes a list of landmarks in need of protection from climate change, tourism, or other threats. The sites have always been on Earth—until January, when the W.M.F. added the moon to that list. There are around 90 cultural landmarks on the lunar surface, such as the site where Apollo 11 became the first piloted spacecraft to land on the moon, in 1969, and boot prints left by NASA astronaut Neil Armstrong, the first person to walk on the lunar surface. Those sites could be damaged by space junk, planned missions to the moon, and future space tourism, W.M.F. officials warn. Safeguarding the moon is tricky since no single government controls it, but officials hope they can persuade countries to work together to protect it. “The moon seems so far outside of our scope,” says W.M.F. President Bénédicte de Montlaur. “But with humans venturing more and more into space, we think it is the right time to get ourselves organized.”