The Seven Wonders of the Ancient World is the first known list of the most remarkable man-made creations of classical antiquity, and was based on guide-books popular among Hellenic (greek) sight-seers and only includes works located around the Mediterranean rim. The number seven was chosen because the Greeks believed it to be magical. The Greek category was not "Wonders" but "theamata", which translates closer to "must-sees".
The list that we know today was compiled in the Middle Ages , by which time many of the sites were no longer in existence. Today, the only ancient world wonder that still exists is the Great Pyramid of Giza. The other six wonders are: the Hanging Gardens of Babylon, the Temple of Artemis at Epheseus, the Statue of Zeus at Olympia, the Mausoleum of Maussollos, the Colossus of Rhodes and the Lighthouse of Alexandria.

The New Seven Wonders of the World is a project that attempts to revive the Seven Wonders of the Ancient World concept with a list of modern wonders. A popularity poll was organized by the private New7Wonders Foundation, with winners announced on July 7, 2007 in Lisbon, Portugal. The voting for the New 7 Wonders of the World, was called to be the first worldwide democratic exercise in mankind's history and is recognized to have no scientifical meaning.
The new seven wonders are: Chichen Itza, the Christ the Redeemer, the Great Wall of China, the Machu Picchu, the Taj Mahal, Petra and the Colosseum.