Add Yahoo as a preferred source to see more of our stories on Google. Giant's Causeway in Northern Ireland features around 40,000 exposed polygonal columns of basalt in perfect horizontal sections.

This video shows a large wall of basalt columns rising from a grassy volcanic landscape in Iceland. The tall stone formations ...

This collection of basalt columns was recorded in a canyon north of Molokai, at a depth of just over a mile, according to Nautilus Live Ocean Exploration Trust. YouTube video screengrab Newly recorded ...