The Seven Wonders of the World History

The Seven Wonders of the World has historically been a listing of seven sites known to the Ancient Greeks as the most notable locales in their known world.
Since then, many have developed lists of the "modern" Seven Wonders of the World. The only list that really stands out and has stood the test of time for more than a decade is the Seven Wonders of the Modern World, developed by the American Society of Civil Engineers.
The Original Seven Wonders of the World :

The Colossus of Rhodes
The Great Pyramid of Giza
The Hanging Gardens of Babylon
The Lighthouse of Alexandria
The Mausoleum at Halicarnassus
The Statue of Zeus at Olympia
The Temple of Artemis at Ephesus

The Seven Wonders of the Modern World :

Channel Tunnel
CN Tower
Empire State Building
Golden Gate Bridge
Itaipu Dam
Netherlands North Sea Protection Works
Panama Canal

Natural Wonders of the World:
in 1997, CNN announced a listing of the Seven Natural Wonders of the World...
Grand Canyon

The Great Barrier Reef
The Harbor at Rio de Janeiro
Mt. Everest
Northern Lights
Paricutin Volcano
Victoria Falls

The "New" Seven Wonders of the World :
On July 7, 2007 (7-7-07) an organization announced a "new" set of the Seven Wonders of the World based on online voting from around the world...

Chichen Itza, Mexico - Mayan City
Christ Redeemer, Brazil - Large Statue
The Great Wall, China
Machu Picchu, Peru
Petra, Jordan - Ancient City
The Roman Colosseum, Italy
The Taj Mahal, India

source : http://geography.about.com/