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Brazilian artists Tiago Primo and his brother Gabriel hang out at a wall in Rio de Janeiro

Brazilian artists Tiago Primo (top) and his brother Gabriel hang out at a wall in Rio de Janeiro July 8, 2009. The bizarre vertical "house" built on a climbing wall by Brazilian artists has been drawing the attention of thousands who walk by the installation in Rio de Janeiro's downtown neighbourhood. REUTERS/Bruno Domingos (BRAZIL SPORT SOCIETY) FOR BEST QUALITY IMAGE ALSO SEE: GM1E59F1QI101 - RTR25GTH

Unusual homes

Snapshots of the most unusual homes around the world, including those built upside-down, in trees and out of ice.