www.ushmm.org
http://www.theholocaustexplained.org/
Pictures:
http://www.theholocaustexplained.org/ks3/the-final-solution/the-death-camps/treblinka/(Treblinka II map)
http://www.deathcamps.org/treblinka/photos.html(title background, the Zoo and the Armory