1.  
  2. Messeturm, Frankfurt by Tobi_2008 on Flickr.

    Frankfurt, Hesse, DE

     
  3. Anole Lizard on Pink by motleypixel on Flickr.

    Old West Austin, Austin, TX, US

     
  4.  
  5. Stairs by swisscan on Flickr.

     
  6.  
  7. ~ Gradient Grid ~ by ViaMoi on Flickr.

    Ottawa South, Ottawa, ON, CA