1. Eiffel Tower, Paris, France -
Before travelling to any place its prior knowledge is must here the Eiffel tower of Paris is a wrought iron lattice tower and it is the most famous engineered art-work in the world. The location of this tower is in the Champ DeMars which was named after the engineer Gustave , with a height of around 324 meters it is one of the tallest structure of Paris. It is the most-visited paid monument in the world with around seven million people visited in 2011. This iconic tower has 3 levels for visitors, which include restaurants on the 1st and 2nd level. The top level is 276m above the ground which can be visited only by lift though it has steps but only the 1st level is 300 step above the ground level as is the distance from the first to second level.