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Boat tour to Ball's Pyramid. Ball's Pyramid is an erosional remnant of a shield volcano and caldera that formed about 6.4 million years ago. It lies 20 kilometres (12 mi) southeast of Lord Howe Island and at 562 meters is the tallest volcanic stack in the world. Lorde Howe Island Group, New South Wales, Australia. The island is in the Tasman Sea east of the Australian mainland and is a UNESCO World Heirtage Site. Oct 9, 2017 for National Geographic Travel by Taylor Glenn