All 6 Uses

although
in
The Grapes of Wrath
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Although an observer could not have told why, Noah left the impression of being misshapen, his head or his body or his legs or his mind; but no misshapen member could be recalled.†
Chpt 8

although = even though -- used to connect contrasting ideas
And the families learned, although no one told them, what rights are monstrous and must be destroyed: the right to intrude upon privacy, the right to be noisy while the camp slept, the right of seduction or rape, the right of adultery and theft and murder.†
Chpt 17
And as the worlds moved westward, rules became laws, although no one told the families.†
Chpt 17
And although they were dead weary and the morning heat was growing, they stopped.†
Chpt 18
Now farming became industry, and the owners followed Rome, although they did not know it.†
Chpt 19
They imported slaves, although they did not call them slaves: Chinese, Japanese, Mexicans, Filipinos.†
Chpt 19 *

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)