This collection of basalt columns was recorded in a canyon north of Molokai, at a depth of just over a mile, according to Nautilus Live Ocean Exploration Trust. YouTube video screengrab Newly recorded ...

Giant's Causeway in Northern Ireland features around 40,000 exposed polygonal columns of basalt in perfect horizontal sections. Chris Hill/Photodisc via Getty Images The reason patterns often appear ...

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A clip purporting to show a secret doorway embedded in a rockface was created as part of a promotional campaign for Northern Ireland’s Giant’s Causeway, a World Heritage Site filled with basalt ...