The following trips feature columnar joints:
Volcanic Island Hopping - visits Los Organos on La Gomera
Spitsbergen and North East Greenland - often visits Viking Bugt see photo opposite.
The Vulcanologist's Dream - visits Reynisfjara where columnar jointing can be seen on the beach.
The Birth of Geology - visits Fingal's Cave on the Isle of Staffa.
Yellowstone, Dinosaurs and Grand Canyon - visits Sheepeater Cliff in Yellowstone National Park.