The oldest of the seven wonders of the ancient world is also the only structure that's still in existence today. The Great Pyramid of Giza in Egypt stands as a testament to human ingenuity.
Colossus of RhodesThe statue was erected to celebrate the defeat of the army of Demetrius in 304 BC, using the money they made by selling the weaponry that Demetrius left in Rhodes after his defeat. This wonder of the ancient world only stood for approximately 56 years before collapsing by an earthquake in 226 BC.
The Seven Wonders of the World are a group of places around the globe that are considered to be of great importance. These are: The Colosseum in Italy, Petra in Jordan, Chichén Itzá in Mexico, Christ the Redeemer in Brazil, Machu Picchu in Peru, Taj Mahal in India and The Great Wall of China.
The Amber Room, often referred to as the “Eighth Wonder of the World”, was one of Russia's most priceless works of art until it was looted by Nazi Germany and lost after the conclusion of WW II.
The greatest tourism and geoscience attraction in the southern hemisphere, in the nineteenth century were the siliceous Pink and White Terraces, the lost Eighth Wonder of the World in New Zealand. In 1886, the Mount Tarawera eruption buried the terraces.
Eighth Wonder of the World is an unofficial title sometimes given to new buildings, structures, projects, designs or even people that are deemed to be comparable to the seven Wonders of the World.
Cristo Redentor: This is the youngest monument on the list. This Art Deco statue sits atop a mountain overlooking Rio de Janeiro. It stands 98 feet (30 meters) tall, and its arms stretch 92 feet (28 meters) wide. It's become a symbol of Rio specifically, Brazil in general, and modern-day Christianity at large.
The Eiffel Tower is not considered one of the new Seven Wonders of the World. It was a finalist in the contest held by the New 7 Wonders Foundation, however, it was not selected.
While the entries have varied over the centuries, the seven traditional wonders are the Great Pyramid of Giza, the Colossus of Rhodes, the Lighthouse of Alexandria, the Mausoleum at Halicarnassus, the Temple of Artemis, the Statue of Zeus at Olympia, and the Hanging Gardens of Babylon.
Now, let's get back to our main question, and explore whether Niagara Falls is a wonder of the world. The answer, again, is a No! Niagara Falls doesn't even find a mention in the unofficial list of seven wonders of the world, let alone the official one [if there would be any].
One of the Seven Wonders of the World, the Grand Canyon is an unbelievable spectacle of nature. It is a great, huge slash in the surface of the earth - 217 miles long, 4 to 18 miles wide and a mile deep, with the Colorado River flowing at the bottom.