Towering over 900 feet over the brilliant waters of the Pacific, the Cape Pillar Sea Cliffs are a must-see attraction for all visitors to Tasmania, which lies off the coast of mainland Australia. These dramatic sea cliffs are the tallest of their kind in the Southern Hemisphere and are protected within the Tasman National Park. You can visit the spectacular cliffs on a boat tour out of historic Port Arthur, or do it the hard way and hike to the cliffs along the 25-mile Cape Pillar Circuit (a 4-day adventure), which will reward you with unsurpassed views of not only the Cape Pillar Sea Cliffs but also Cape Hauy, Monument Lookout and Tasman Island.