Giant Causeway – Northern Ireland This incredible and peculiar natural wonder is nestled next to the Atlantic Ocean. The Causeway is home to more than 40,000 columns, most are hexagonal and form a honeycomb-like pattern. Giant’s Causeway is created from cooled magma. It took nearly 60 million years of erosion for the columns to be apparent. Scientists think that they were finally exposed 15,000 years ago after the last Ice Age.