Man-Made Rocks Were Used in Stonehenge.

Last edited on Feb. 23, 2019
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Above photo shows man-made rocks in a "quarry" in Wales, UK. From the "quarry", ancient people obtained the man-made rocks that were used to build the Stonehenge. Red arrow points to a man-made rock. Both Stonehenge and the Giant’s Causeway used "basalt columns" (note 1), which are actually man-made rocks (note 2).

Note 1: see the fourth paragraph in [link to arstechnica.com (secure)]
Note 2: see Thread: Humans Constructed “Basalt Columns” on Earth and on Mars.

Last Edited by Faceless2 on 02/23/2019 09:37 AM