The great mystery of where all the aliens are in our vast Universe contemplates ancient interstellar civilizations building enormous megastructures that rival worlds or even stars in the ...

Drone photographs taken of a 3,000-year-old “mega fortress” nestled deep in the Caucasus Mountains reveal the settlement is ...

Cueva de Los Murielagos (which means Cave of the Bats) is a cave system that was found by miners in the 19th century near ...