Disney characters make unexpected appearances all over Iran 's amusement parks . Theme park expert Zwanzger says Tehran is home to 150 of the world 's worst roller coasters . Zwanzger has visited 150 theme parks on 150 continents .
Disney characters make unexpected appearances all over Tehran 's amusement parks . Theme park expert Stefan Zwanzger says Iran is home to one of the world 's worst roller coasters . Zwanzger has visited 150 theme parks on five continents .