Horseshoe Curve

Horseshoe Curve, Pennsylvania.
Visitors today still marvel at the grace at which trains wind through this curve. Several hundred Irish laborers used nothing more than their own hands, gunpowder, and pack animals to carve out the track's bed along the slopes of the Allegheny Mountains. The result were historic - the previously impenetrable Alleghenies had been conquered and America had its gateway to the west... Looks really beautiful place.