For me, the treasures of Paris are the things that are least appreciated. But without them, the city would have much less charisma.
For example, I enjoy more the music of a musician who plays his favorite songs under a bridge, then going to an expensive club, where a spoiled pop star is singing. I do agree that the streets of Paris are way too crowded with traffic, but isn’t it a beautiful sight at night? The smell of the the subway is sometimes unbearable, but if it would smell like roses or toilet cleaner.. traveling by metro won’t be adventure to me anymore.
That’s why the treasures of Paris aren’t something you can hold. But something that you are going to miss when it’s gone.