Tunnels - Atlas Obscura

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Nebraska National Forest

From Prairie Grasslands to Man-Made Forests: Discover Nebraska's Natural Wonders

From a subterranean network of hidden tunnels to the largest man-made forest in the country, the wonders of nature are extraordinary.
Dayton, Nevada

Sutro Tunnel

This colossal underground passage paved the way for large-scale drainage and access tunnels across the U.S., but it almost wasn’t built.