From Unexplored Syria, pg 36 

You were so kind as to insert a letter from me last May concerning `Tadmor in the Wilderness,' and I shall feel glad if you find a pendent letter about Ba'albak, its rival in the traveller's interest, -worthy of a similar favour.  Many of your readers have visited or intend to visit its magnificent ruins —gigantic remains which Rome herself cannot show -- and they will be thankful for the information which my five days under canvas in the midst of its temples enable me to give them.

It is hard to see why Baalbek was included in the Mark Twain’s Holy Land tour; it is surely magnificent, quite magnificent, but its magnificence stems from it being the Roman Empire’s most sacred site of pagan worship, and the largest temple complex in the whole Roman Empire.

From Handbook for Travelers (1898): Route 37 Page 367

We had a tedious ride of about five hours, in the sun, across the Valley of Lebanon. It proved to be not quite so much of a garden as it had seemed from the hill-sides. It was a desert, weed-grown waste, littered thickly with stones the size of a man’s fist. Here and there the natives had scratched the ground and reared a sickly crop of grain, but for the most part the valley was given up to a handful of shepherds, whose flocks were doing what they honestly could to get a living, but the chances were against them.

There was nothing else to do, and so every body went to hunting relics. They have stocked the ship with them. They brought them from the Malakoff, from the Redan, Inkerman, Balaklava—every where. They have brought cannon balls, broken ramrods, fragments of shell—iron enough to freight a sloop. Some have even brought bones—brought them laboriously from great distances, and were grieved to hear the surgeon pronounce them only bones of mules and oxen. I knew Blucher would not lose an opportunity like this. He brought a sack full on board and was going for another.

We went to the great Bazaar in Stamboul, of course, and I shall not describe it further than to say it is a monstrous hive of little shops—thousands, I should say—all under one roof, and cut up into innumerable little blocks by narrow streets which are arched overhead. One street is devoted to a particular kind of merchandise, another to another, and so on.

We visited the Thousand and One Columns. I do not know what it was originally intended for, but they said it was built for a reservoir. It is situated in the centre of Constantinople. You go down a flight of stone steps in the middle of a barren place, and there you are. You are forty feet under ground, and in the midst of a perfect wilderness of tall, slender, granite columns, of Byzantine architecture.

We visited the Dancing Dervishes. There were twenty-one of them. They wore a long, light-colored loose robe that hung to their heels. Each in his turn went up to the priest (they were all within a large circular railing) and bowed profoundly and then went spinning away deliriously and took his appointed place in the circle, and continued to spin. When all had spun themselves to their places, they were about five or six feet apart—and so situated, the entire circle of spinning pagans spun itself three separate times around the room. It took twenty-five minutes to do it.