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Roofs.

https://en.wikipedia.org/wiki/Roof



"Roof diagram" by KDS444 - Own work. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Roof_diagram.jpg#/media/File:Roof_diagram.jpg






























Rooftop helipads sometimes display a large two-digit number, representing the weight limit (in thousands of pounds) of the pad. In addition, a second number may be present, representing the maximum rotor diameter in feet.





"LeBlanc Roofing" by National Institute for Occupational Safety and Health - http://www.flickr.com/photos/niosh/9253633549/. Licensed under Public Domain via Commons - https://commons.wikimedia.org/wiki/File:LeBlanc_Roofing.jpg#/media/File:LeBlanc_Roofing.jpg














Lightning rod

https://en.wikipedia.org/wiki/Lightning_rod








































"Lightning-rod-diagram" by Wdchk - Own work. Licensed under CC BY-SA 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Lightning-rod-diagram.svg#/media/File:Lightning-rod-diagram.svg




Parkour attacks from Exarchia rooftops against riot police