We know what the natural wonders of the world are (the Grand Canyon, Mount Everest, etc.), but what about the absolute must-see buildings? The ones that will make your jaw drop and will have you asking, "how did they do that!?"
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6. The Channel Tunnel (aka: The Chunnel), Europe
This incredible underwater feat of engineering brought England and France together and took several tries to make. Now, high-speed trains are used to transport over 16 million people between the two countries every year.
Next: The tallest tower