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Buildings - Rotterdam, The Netherlands;  photo by renfie, via Flickr

Buildings - Rotterdam, The Netherlands; photo by renfie, via Flickr

Condo Tower, South of Market St., San Francisco, CA;  photo by CTG/SF, via Flickr

Condo Tower, South of Market St., San Francisco, CA; photo by CTG/SF, via Flickr

The CN Tower in Toronto, Canada;  144 stories high ...and 1,769 stairs!;  photo by Lisa-S, via Flickr

The CN Tower in Toronto, Canada; 144 stories high ...and 1,769 stairs!; photo by Lisa-S, via Flickr

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