One stretch of that platform, two hundred feet long, is composed of blocks of stone as large, and some of them larger, than a street-car.

They surmount a wall about ten or twelve feet high.

I thought those were large rocks, but they sank into insignificance compared with those which formed another section of the platform.

These were three in number, and I thought that each of them was about as long as three street cars placed end to end, though of course they are a third wider and a third higher than a street car.
Perhaps two railway freight cars of the largest pattern, placed end to end, might better represent their size.

In combined length these three stones stretch nearly two hundred feet; they are thirteen feet square; two of them are sixty-four feet long each, and the third is sixty-nine.
They are built into the massive wall some twenty feet above the ground.
They are there, but how they got there is the question.