The document describes 9 of the most extreme bridges in the world. These bridges include the Immortal Bridge in China formed by rocks tumbling down a mountain, the Old Bridge of Konitsa in Greece that rings a bell in strong winds, and the Carrick-a-Rede Rope Bridge in Ireland that sways 30 meters above jagged rocks. Other bridges mentioned are the Royal Gorge Bridge in Colorado, formerly the highest in the world, Inca rope bridges in Peru, Pulau Langkawi's suspended bridge in Malaysia, and the Vitim River Bridge in Siberia, which is the only way to cross the wide river.