Browse Conspiracy Theories

The Piri Reis map is a genuine 1513 Ottoman world chart, one-third of which survives, that alternative-history writers claim depicts the coastline of Antarctica ice-free—proving a lost advanced or extraterrestrial civilization mapped the planet during the last Ice Age. Cartographic historians instead read the puzzling southern landmass as a distorted, wrapped rendering of South America's coast.

In 1976 NASA's Viking 1 orbiter photographed a mesa in the Cydonia region of Mars that, under low resolution and slanting sunlight, resembled a humanoid face. Fringe researchers argued it was an artificial monument built by a lost Martian civilization and that NASA covered up the truth, but higher-resolution imaging over the following decades resolved it into an ordinary eroded hill.