What are the seven wonders of the world?

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Let us discuss about the seven wonders of the world. We have been listening and talking about the seven wonders of the world which include Taj Mahal of Agra. To day the situation has been changed many monuments in many countries are claiming to be the wonder of the world. I have to many to mention as the seven wonders of the world but before I disclose I want to know from all of you to cite according to your choice which are the seven wonders of the world.Please discuss and comment on the matter.