<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x430/54cac19bc4193_-_strange_dams_16_0311-xl.jpg>
<http://www.popularmechanics.com/technology/design/g509/the-worlds-18-strangest-dams/>