Six sided columnar basalt

Found a site with some amazing pictures of columnar basalt. Columnar Basalt is formed from cooling lava flows. The cooling process of the original lava flow causes cracks to form in the rock. Subsequent immersion in water causes the cracks to cool at a faster rate than the rest of the rock. So the cracks spread downward, forming the columns seen in the formations.
The most famous formation of columnar basalt, is the Giant's Causeway in northern Ireland. But columnar basalt can be found throughout the world.

For more pictures, check out Centripetal Notion: Columnar Basalts