Lake Titicaca is the largest lake in South America, and because of its size and high altitude (3,812 m/12,507 ft) is the highest navigable lake in the world. The lake is considered to be the ...
With more than 50 million tourists each year, London is the most visited city in Europe and among the most visited cities worldwide. The Burj Khalifa, the highest structure in the world, is one of ...