Travelers are voting Taj Mahal, Engelsberg Ironworks and Mehmed Pasa Sokolovic Bridge as the best of 7726 key buildings in the World. Also popular are Jesuit Block and Estancias of Cordoba in Argentina, Derwent Valley Mills in England and Ir.D.F. Woudagemaal in Netherlands. Want more? Check out our map of key buildings in the World or these 13 key buildings in Switzerland.