An evocative shot contrasting the size of a man with the towering trees of the earth in Tulare County, California, United States (aluyten flickr)
An evocative shot contrasting the size of a man with the towering trees of the earth in Tulare County, California, United States (aluyten flickr)
The Ear of Dionysius, the largest of the many caves in Siracusa, on the island of Sicily. The shape of the cave creates astonishing acoustical effects wherein a whisper at one end of the cave can be heard clearly at the other. (image by Stefania Guidice)
Demanovska Cave “Freedom Cave” the longest cave system in the country of Slovakia, central Europe. Slovakia was formed in 1993 following the peaceful dissolution of Czechoslovakia. (admian on pixdaus.com)
Tierra del Fuego, off the southernmost tip of South America. Tierra del Fuego is divided between the countries of Chile and Argentina. (Walter Q on flickr)
Tavurvur, an active volcano near Rabaul, Papua New Guinea, has erupted as recently as January 2009.