Halema'uma'u crater and Kilauea Caldera, Volcano National Park, Hawaii -- First visited by a Westerner (missionary and author William Ellis) in 1823, the caldera was then almost 1000 feet deep and filled with raging lakes of molten lava. In the 19th century, the floor collapsed 4 times. This pretty much stopped for the Caldera by 1905. However Halemaumau Crater has had 7 new lava flows since then.
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