What are some special facts such as the dates, why it was built or etc. of the new wonders of the world?

Answer 1

There have been many lists of modern wonders. Which list are you considering?

Answer 2

The new wonders:
Great Wall of China
Petra, Jordan
Christ Redeemer, Brazil
Chichen Itza, Mexico
Roman Colosseum, Italy
Taj Mahal, India
Machu Picchu, Peru

Answer 3

Here's a start:

http://www.travelchinaguide.com/china_great_wall/

http://visitjordan.com/Default.aspx?tabid=63

http://architecture.about.com/od/greatbuildings/ig/New-Wonders/Christ_the_Redeemer-lge2.htm

You can Google the other wonders.