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Four hundred bridges cross the labyrinth of canals that form the 120... News PhotoBlue,Bridge - Man Made Structure,Canal,Color Image,Europe,Horizontal,Italy,Lagoon,Maze,NASA,River,Satellite View,Science and Technology,Square,Venice - ItalyPhotographer Collection: SSPL SSPL/NASAITALY - JULY 18: Four hundred bridges cross the labyrinth of canals that form the 120 islands of Venice, situated in a saltwater lagoon between the mouths of the Po and Piave rivers in northeast Italy. All traffic in the city moves by boat. Venice is connected to the mainland, 4 kilometers (2.5 miles) away, by ferries as well as a causeway for road and rail traffic. The Grand Canal winds through the city for about 3 kilometers (about 2 miles), dividing it into two nearly equal sections. This image was acquired on December 9, 2001 by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite. With its 14 spectral bands from the visible to the thermal infrared wavelength region, and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), ASTER will image Earth for the next 6 years to map and monitor the changing surface of our planet.The broad spectral coverage and high spectral resolution of ASTER will provide scientists in numerous disciplines with critical information for surface mapping, and monitoring dynamic conditions and temporal change. The Terra mission is part of NASA's Earth Science Enterprise, a long-term research and technology program designed to examine Earth's land, oceans, atmosphere, ice and life as a total integrated system. Size: 38.6 x 34.5 km (23.9 x 21.4 miles) Location: 45.4 deg. North lat., 12.3 deg. East long. Orientation: North at top Image. (Photo by NASA/SSPL/Getty Images)