They have stones like that on the west coast of the South Island in New Zealand called the Moeraki boulders. I don't care to speculate whether they
are natural or manmade. All I know is the description when i visited was that they are bubbles of molten rock that have been exposed through the
erosion of the surrounding soil. New Zealand is a pretty volcanic place so the theory makes sense.
Photo's:
photos.travelog.org...
*Edit - Costa Rica is in the rainforest so erosion is probably an issue there too. Not as much as the Pacific coast, but the erosion could take place
over time.
[Edited on 23-10-2003 by insite]
