The giant's causeway was formed over 50 million years ago by a volcanic eruption. The rapidly cooling magma formed around 40,000 hexagonal basalt columns, similar formations from the same eruptions can be seen in Iceland and Scotland. The causeway is located just outside the town of Bushmills, the oldest licensed distillery in the world, it has been making whiskey since 1608.

A more popular explanation for the formation of the causeway is a feud between the legendary Irish warrior and Giant Fionn MacCumhaill and his Scottish counterpart Benadonner. Fionn spent days driving the columns into the sea in order to build a causeway to Scotland in order to fight Benadonner. However as Fionn was nearing Scotland he discovered that Bennadonner was much larger than he had thought and so he fled in fear back to Ireland and his wife Oonagh, terrified that Bennadonner would use the causeway to come to Ireland to fight him. Luckily Oonagh had a plan, she swaddled Fionn like a baby and waited patiently for Bennadonner. When the Scottish giant arrived she introduced him to Fionnn's baby and now Bennadonner was terrified at the monster that could produce such a child. Benadonner fled back to Scotland tearing up the stones as he ran, leaving behind only what remains today.

"Fionn MacCumhaill is one of the most famous figures in Irish folklore. As well as creating the Giant's Causeway he is also credited with creating Ireland's largest lake, Lough Neagh, by picking up a ginormous boulder and throwing it at his enemy Benadonner in Scotland, leaving behind a crater that filled with water to become the lake."