Wonder mean such a thing which is unique due u its structure or creation. Its uniqueness makes that thing wonder. In this world God has Creator several things for humans to think about Him & remark His Glory.
There are different wonders of world , like natural wonders, man constructed wonders, accents wonders etc at different places in the world to enjoy.
Natural Wonders:
Natural wonders are like places developed naturally. God has put some uniqueness into them like Canada has lot of lakes & beautiful Niagara Fall. Same Switzerland has beautiful locations, even from all around the world film industries loves to pictured their movie’s scene over there. Same Poland is full natural beauty.
Man-constructed Wonders:
These are such a wonder which are developed by human beings. As we know, every age of time man want to do something different and wanted that upcoming generation admire thire dignity & work art.It is the struggles & hard work of many people. You can see such a wonder in Egypt. You can see Spain & Italy, how accents have developed that cities. One can see “ Taj Mahal “ in India. The great Wall of China is also one of them. And much more.