Photo: The caves of Nerja, near the town of Nerja in Andalusia, photographed on February 14, 2012. The caverns stretch for almost 5 km, and show evidence of being inhabited by humans as far back as 25,000 BC. (Jorge Guerrero/AFP/Getty Images) - Via In Focus: http://theatln.tc/N1WmgU
Photo: A staff member of the metropolitan outer floodway management office looks around pressure-adjusting water tank, a part of a massive underground water discharge tunnel which was constructed to protect Tokyo and its suburb area against floodwaters and overflow of the city's major waterways and rivers during heavy rain and typhoon seasons, at the facility in Kasukabe, north of Tokyo, on September 28, 2011. The world largest underground discharge channel at 50 meters below ground is more than 6 km long, and can hold 670,000 tons of water at maximum, the management office said. The ceiling of the concrete water tank is supported by 59 pillars, each 7 meters long, 2 meters wide, 18 meters tall, and weighing 500 tons. (Reuters/Kim Kyung-Hoon) - Via In Focus: http://theatln.tc/N1WmgU
Photo: Tourists view the lower cave of the Jeita Grotto by boat in Jeita, north of Beirut, Lebanon, on October 4, 2011. (Reuters/ Sharif Karim) - Via In Focus: http://theatln.tc/N1WmgU
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Tourists view the lower cave of the Jeita Grotto by boat in Jeita, north of Beirut, Lebanon, on October 4, 2011. (Reuters/ Sharif Karim) - Via In Focus: http://theatln.tc/N1WmgU
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