R.I.P. Tree Tunnel: Plus Six More Natural Structures Wiped Out By Mother Nature

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Natural Bridge Falls, Montana
John Lambing / Alamy5/6

Natural Bridge Falls, Montana

The Boulder River once flowed under a natural rock bridge, which gave Natural Bridge State park its name. But after years of high waters that cut away at the rock bridge, it collapsed in July 2008, making the 100-foot Natural Bridge Falls waterfall a little less picturesque.

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