Namsan tower was located in Seoul, South Korea. It was built in 1969 and opened to public in 1980.
Many visitor ride the namsan cable car up the mountain and w
alk to the tower. the tower features a gift shop and restaurants on the ground floor. Most of the city of seoul can be seen from the top of Seoul.

The Eiffel Tower id an iron lattice tower located in Champ de Mars in Paris. The Eiffel Tower is the tallest tower in Paris. The tower has a length of 324 meter, same as a 81 floor building. The tower has three levels for visitors. The third level observatory's upper platform is at 279.11 m the highest accessible to the public in the European Union 

The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,600 kilometres over an area of approximately 344,400 square kilometres.tghe great barrier reef can be seen from the outerspace. It is located at Queensland, Australia.