Alleghenies (Top 50 TOP)

: An 17.6-mile trek through history featuring two dark, damp, and abandoned tunnels (Sideling Hill and Ray's Hill) left behind when the highway was rerouted.

: The region's rich deposits of bituminous coal, timber, and iron fueled the Industrial Revolution, though this legacy includes significant environmental impacts from practices like mountaintop removal. alleghenies

The mountains have shaped American industry and transportation: : An 17

: A sharp, massive escarpment that serves as the Eastern Continental Divide , separating the Mississippi River and Chesapeake Bay watersheds. and iron fueled the Industrial Revolution

: The Allegheny Portage Railroad was a 19th-century marvel that used inclined planes to haul canal boats over the mountains.