Megaliths: Megaliths are large stones used in various prehistoric structures, including stone circles. They can be upright (like standing stones) or horizontal (like capstones).
Henge: A henge is an archaeological term referring to a circular enclosure surrounded by a ditch and bank. Stonehenge is an example of a henge monument.
Solstice Alignment: Some stone circles were designed so that specific stones align with the rising or setting sun during solstices (the longest and shortest days of the year).