Interesting. I've never seen structures built from columnar basaltic jointing
Nick Zentner's On the Rocks 5min PBS overview: https://www.youtube.com/watch?v=cWGoiOFgpKI
Search for his name to find his own channel on YT and whole hour+ long public lectures on this and more geology. He's fun to watch, especially in the older public lectures to an audience in an auditorium.