<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/768x516/54cac19c42c02_-_strange_dams_17_0311-xl.jpg>
<http://www.popularmechanics.com/technology/design/g509/the-worlds-18-strangest-dams/>