Prince Albert thought up the idea to have the Great Exhibition, it's purpose was to gather as many artefacts and inventions from all over the world to increase international trade. I hope this helps :)
Henry Cole.
Milana Quin
Pericles had the idea to build the Parthenon.
Prince Albert
sa
The idea to build the Great Wall of China belonged to Emperor Qin Shihuang. The wall was built by ordinary people who lived in China at that time.
Edouard Laboulaye
Roger Sherman
It was all the Romans who built it and there ideas not one in general
charlie milkthecow did
FDR Not Ronald Reagan
Theodore Roosevelt is generally attributed with the idea because he started the canal, but I am fairly sure that sailors had that idea as well but they were not in the place to do something about it and so they just dreamt about it.