Tallest volcanic columns

Devils Tower (aka Bear Lodge) in Wyoming, USA, was formed as an underground intrusion of igneous rock, more than 50 million years ago. Over time the surrounding softer sedimentary rock eroded leaving the monolithic landmark towering over the current landscape. It is composed of volcanic columns, formed as the magma intrusion cooled and shrank, some of which soar to 867 feet (264.2 metres) above the surrounding plains. The summit, which is around the size of an American football field in area, is approximately 5,112 feet (1,558 metres) above sea level.

Another famous example of this type of volcanic column can be seen at the Giant's Causeway in County Antrim, Northern Ireland.