• Cmdr_Hadfield/Twitter
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    This photo of Peru's Nazca Plain was tweeted by Chris Hadfield on March 1. He wrote, "The ancients in Peru made lines & patterns on the Nazca plain. Imagine if they knew people would see them from here! pic.twitter.com/a8OTBt83hj"

  • AstroMarshburn/Twitter
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    This photo of northern Arizona's Glen Canyon Dam and Lake Powell was tweeted by astronaut Thomas H. Marshburn from the International Space Station on March 1. He wrote, "Glen Canyon Dam and Lake Powell pic.twitter.com/nnxtCwi6XX"

  • Phil Walter/Getty Images
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    Athletes start the New Zealand Ironman on March 2 in Taupo, New Zealand.

  • AP Photo/Charlie Riedel
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    A hot air balloon decends to land as the sun sets north of Phoenix Friday.

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    This photo of a highway in the Appalachian Mountains was tweeted by astronaut Thomas H. Marshburn from the International Space Station on March 1. He wrote, "A highway threads its way across the Appalachians. pic.twitter.com/XHbcKBKPIf"

  • Mario Tama/Getty Images
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    People walk on a closed beach damaged by flooding from Hurricane Sandy not far from the Verrazano-Narrows Bridge on March 1 in the Staten Island borough of New York City.

  • AP Photo/Mark Thiessen
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    A dog looks through the gated door on musher Mitch Seavey's truck at the ceremonial start of the 2013 Iditarod Trail Sled Dog Race in Anchorage, Alaska on Saturday. The race, which will take mushers and dog teams about a thousand miles across the Alaska wilderness, starts Sunday in Willow, Alaska. 

  • NASA Earth Observatory
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    NASA's Earth Observatory released this image of Tibet's Yarlung Tsangpo, the "Everest of Rivers," on March 2. Stretches of the river are some of the least-explored places in the world, and tales of failed expeditions abound. With headwaters in western Tibet near Mount Kailash, the river has the highest average elevation—13,000 feet—of any major river in the world.

  • AP Photo/Schalk van Zuydam
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    A woman blows blue paint powder on to her friend during the holi one colour Festival held in the city of Cape Town, South Africa, Saturday. Thousands of people are taking part in the festival by throwing coloured paint powder at each other to express freedom and the color of everyday life.

  • Cmdr_Hadfield/Twitter
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    Next: Yesterday's Must-See Pics

    This photo of Barbados was tweeted by astronaut Chris Hadfield from the International Space Station on March 1. He wrote, "Barbados. Bridgetown harbor is where I first learned to SCUBA dive. Who knew it would lead to walking in space? pic.twitter.com/v7RDJGQBfl"