Squigly Squigly's Brain Teasers

Question:

I tower over the man-made plain;
My peaks scrape the heavens.
I have many brothers; in fact,
We may be as many as a hundred and seven.

We're as ancient as the oldest trees,
But not older than the hills.
We've been studied for centuries now,
But with mystery we're still filled.

Answer:

The pyramids of Egypt.

Try another Brain Teaser:

What loses its head every morning; but gets it back every night?

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