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American scientists have discovered that the farther the Moon is from Earth, the longer a day lasts.

Scientists around the world have tried to unravel its contents, but none have succeeded. Now, technology promises to help solve this 600-year-old mystery.

Although they are a great archaeological find, the origin of the stone spheres remains a mystery to mankind.

Treasure hunters have searched for the Holy Grail for centuries, and hundreds of people have claimed to possess it.

For Jill Tarter, who participates in the project to search for intelligent life beyond Earth, contact with alien civilizations is just a matter of time.

Sailors, military, fishermen, divers, travelers and oceanographers have reported stories about humanoid creatures that live in oceans, rivers and lakes.

A British tech businessman seeks help repairing a Cold War-era radar antenna and turning it into a UFO detector.

For decades, the mystery of the "Sailing Stones" has left many scientists puzzled and unanswered.