7. Taj Mahal of Agra

It was constructed by famous Mughal ruler Shah Jahan in memory of his beloved wife Mumtaz Mahal. The Taj Mahal is regarded as the best example of Mughal architecture and is widely recognized as “the jewel of Muslim art in India”. It is one of the world’s most celebrated structures and a symbol of India’s rich history. The Taj Mahal attracts more than 3 million visitors a year. In 2007 it was declared one of the top 10 Wonders of the World. 
See also; 10 Interesting Facts About Taj Mahal.