Markings on a stone pillar at a 12,000-year-old archaeological site in Turkey likely represent the world's oldest solar calendar, created as a memorial to a devastating comet strike, experts suggest.

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In this video I talk about the different calendars that exist throughout the world. I explain how, in general, calendars are categorized as either being Solar, Lunar, or Lunisolar; with the first ...

Stonehenge is an astonishingly complex monument, which attracts attention mostly for its spectacular megalithic circle and "horseshoe," built around 2600 BC. It had long been thought that the famous ...