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9 wondrous water caves

By: Catie Leary on March 14, 2011, 12:20 p.m.
A boy watches the Alofaaga Blowholes at Taga Village in Samoa

Photo: ...your local connection/flickr

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Alofaaga Blowholes

One of the most exciting and magnificent natural attractions in the small island country of Samoa are the Alofaaga Blowholes. When high tide rolls in, powerful waves are jettisoned up through a series of tubes created from lava flows, causing a watery explosion similar to that of a massive fountain or geyser.

This definitely isn't a cave for spelunking, however; the breaking water that splashes through the high pressure tubes would easily kill anybody who was unlucky enough to fall through the holes.

This lethal force is often demonstrated on a smaller scale by the locals in the area, who will throw coconuts, rocks and other objects into the holes just as they are about to blow (see video).