But cave and bridge are in still life.
Niagara is all activity and change.

No picture gives you the varying form of the water or the change of color; no description conveys to your mind the ceaseless roar.

So, too, the ocean must be unrepresentable to those who have not looked upon it.
"The Natural Bridge stands out bold and high, just as you expect to see it.

You are agreeably disappointed, however, on finding that you can go under the arch and be completely in the coolness of its shade while you look up for two hundred feet to the rocky black and white ceiling above.
"One of the prettiest peculiarities is the fringing above of the trees which hang over the edge, and looking out past the arch the wooded banks of the ravine are very pleasant.

From above, one has the pain always attendant to me upon looking down into an abyss, but at the same time one obtains a better conception of the depth of the valley.