See them before they’re gone! Some of the world’s most awe-inspiring sights are threatened by encroaching development and climate change. Many could disappear in our lifetime.Filed under:
The structures of Tikal, one of the largest archaeological sites of the Mayan civilization, are mostly made of soft limestone -- soft enough to erode when subjected to rain and wind. Tourists aren’t helping, either; many have been known to leave with small stone “souvenirs.”
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