First the Original Seven Wonders of the World ; The Colossus of Rhodes, The Great Pyramid of Egypt, The Pharos of Alexandria, The Hanging Gardens of Babylon, The Statue of Zeus at Olympia, The Temple of Diana (or Artemis) at Epheus, The Mausoleum at Halicarnassus.

Seven Wonders of the Middle Ages ; The Colosseum of Rome, The Catacombs of Alexandria, The Great Wall of China, Stonehenge, The Porcelain Tower of Nanking, China, The Leaning Tower of Pisa, The Hagia Sophia of Constantinople.

Seven Natural Wonders of the World ; The Grand Canyon (Arizona), Rio de Janeiro Harbour, Iguassu Falls (Argentina), Yosemite Valley and the Griant Sequoias of California, Mount Everest, The Nile River, The Northern Lights.

In 1931 the Americans decided to make a new list of the Modern World : The Great Pyramid, Hagia Sophia, Leaning Tower of Pisa, The Taj Mahal (India), Washington Monument, The Eiffel Tower, The Empire State Building

There are variant lists that also include The Panama Canal, The Greek Parthenon, Mont-Saint-Michel (France), St Peter's Church in Rome, temples and shrines in the Nikko National Park in Honshu, Japan, Chichen Itza (Mexico), Machu Picchu (Peru)

You'll find a whole feature on the Ancient Wonders. Just click here article 539