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.
Pericles had the idea to build the Parthenon.
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Milana Quin
Edouard Laboulaye
It was all the Romans who built it and there ideas not one in general
Julian Radice built it for all the beautiful women in Jordan (god helped him have sexy time)
I have no earth idea u?
Joshua Forman came up with the idea to build a canal. De Witt Clinton, governor of New York, saw the great opportunity and made sure of the funding.
Jesse Hawley had the idea to build the Erie Canal. He went broke with his flour mill in Rochester because he could not get his product to the market fast enough. He wrote to the governor of New York. DeWitt Clinton liked the idea and pushed New York legislators for funding.
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.
The Louvre palace, built in 1190 by King Phillip III, as a fortress, was later enlarged and modified by Charles V.
Odysseus got the idea.