10 Places you must visit once in your lifetime The Chinese Great Wall: The Great Wall of China is a must-see location that stretches for thousands of km and is a wonder of ancient engineering. It's a once-in-a-lifetime experience because of the breathtaking views and historical significance. The Great Wall of China is an antiquated defense barrier that encircles China's medieval northern frontiers for more than 13,000 miles (21,196 km). This massive construction, which was constructed over several centuries, is made up of a number of interconnecting walls, watchtowers, and defensive features rather than being one continuous wall. It serves as a symbol of engineering skill, human inventiveness, and historical importance. The Grand Canyon, USA: The Grand Canyon is a breathtaking natural wonder located in the southwestern United States. Here is a synopsis of the Grand Canyon. The Colorado River formed the Grand Canyon, one of nature's wonders, into its cur...