A Las Vegas helicopter pilot reported sighting a UFO visible only with night vision goggles.

A mysterious prehistoric mask was found during excavations in Bulgaria.

Russian newspaper claims that there are organizations of reports and sightings of UFOs in China being protected by the National Society of Extraterrestrials Studies.

The intriguing sculptures of Abydos show a helicopter and other futuristic vehicles.

An indigenous elder shared a story about the "Star People" and their spaceship that crashed on his reserve in the 1940s.

The civilization of Caral, the oldest on the American continent, was contemporary with others such as China, Egypt, India and Mesopotamia, having already converted into a city-state, surrounded by other civilizations gathered, in what is called "village societies".

More than half a century ago, deep in the jungles of Guatemala, a gigantic stone head was discovered and soon forgotten.

The earliest records of the Sumerians date back more than 5,000 years and their origin remains unknown. What we do know, however, is that the Sumerians had a superior, fully developed culture, which imposed on the Semites, partly still barbarians.

The question was answered by 5 experts, and their answers are fascinating.

The concept of alien life visiting Earth, particularly in ancient times, bringing knowledge to early civilizations has undergone a renaissance in recent years.