The original Seven Wonders of the Ancient World was a list compiled by Greek scholars in the 5th century B.C., but the only surviving monument on that list is the Great Pyramid of Giza in Egypt. There have been many other lists of world wonders compiled in other eras.
The several lists of wonders compiled in the 21st century often choose seven sites in homage to the original list. One contest in 2007 received more than 100 million votes and selected such sites as the Great Wall of China, the Colosseum in Rome, the Taj Mahal, the Christ the Redeemer Statue in Rio de Janeiro and the Incan ruins of Machu Picchu. Sites chosen in other lists have included the Hagia Sophia in Istanbul, Stonehenge and the Leaning Tower of Pisa.