Article: Sardinia's stony mysteries; Island's prehistoric towers, wells give glimpse of its heart to trekkers willing to explore interior

It began over a rushing river, on a makeshift bridge of planks, logs and chicken wire. From there it was a scramble up loose rocks, the trail itself barely discernible as I climbed first one and then another steep mountainside.

Then the path, such as it was, ended in a cave mouth set at the very top of a rugged peak.

I was standing at what had been, more than 2,000 years ago, someone's front door.

When the nearly 1,700-foot summit of Mount Tiscali collapsed into a basketball-arena-sized sinkhole called a dolina, someone moved in. Archaeologists still aren't sure who the inhabitants were, or exactly when they arrived. Artifacts found in the valleys below Tiscali suggest people were living in ...

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