I think its the Notre Dame
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The above is incorrect although I do not know the name of the arch you are referring to.
You always see this arch during the end of the Tour de France cycling event and they refer to it often. Notre Dame is a gothic cathedral which has arches but this is not the large stone arch that you are asking about.
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L'arc de Triomphe
do you mean the Arc de Triomphe, up the Champs-Elysées avenue?
It is the Arc de Triomphe, built for Napoleon.
L'arc de Triomphe
The key stone is the stone placed at the apex of the arch, and prevents the two sides of the arch falling in and collapsing.
keystone
Yes, the term Gateway Arch is a proper noun, the name of a specific thing.
There are Eldon, Avendix, Sharpie, Agriland, Brown Stone, Ferguson, and Purple Arch.
It is a very large stone arch in the middle of Paris
L'arc de Triomphe
There are three arches, on the same perspective. The first one is the arch du carousel, a rosy stone arch at the end of the Louvre palace. Up the Champs-Elysées avenue stands the Arc de Triomphe, which is the monumental arch you are certainly thinking of. And a newly-built monumental building, four kilometers up the same perspective in the business district, is the "Grande Arche de La Défense".
"le prix de l'Arc de Triomphe", these days "le Prix Qatar - Arc de Triomphe" is a prestigious horserace held annually in Paris. The name translates as "the Arc de Triomphe trophy / price". The Arc de Triomphe (English: the triumphal arch) is a large stone arch at the upper end of the Champs-Elysees avenue in Paris.
The Arc De Triomphe
The keystone
The key stone is the stone placed at the apex of the arch, and prevents the two sides of the arch falling in and collapsing.
the key stone is the stone that is at the top of an arch. It is this stone that absorbs the majority of the forces stabilizing the arch formed
Newport Stone Arch Bridge was created in 1853.
Lalino Stone Arch Bridge was created in 1870.
Pithole Stone Arch Bridge was created in 1899.
Tusten Stone Arch Bridge was created in 1896.