Tambora Caldera, Sumbawa Island, Indonesia
photo courtesy NASA. Space Shuttle mission STS-026. ID STS026-38-056

April 10, 1815 - Mount Tambora erupts
The gas and debris resulting from the eruption changed the Earth's climate,
and the summer of 1816 became known as "The Year Without a Summer."

Recent excavations have unearthed a "pompeii-style" buried civilization.
from National Geographic: "Lost Kingdom" Discovered on Volcanic Island in Indonesia