If Gold Rush history and ghost hunting pique your interest, these old Colorado tunnels, located not far from Colorado Springs, are a must-visit attraction.

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A railroad built a train tunnel near Fredericksburg 100 years ago, then later abandoned it. Then some of nature’s strangest creatures moved in.

Since it launched on Halloween 2016, the Ghost Train typically runs twice each night. Between Sept. 1 and March 31, the public art installation typically runs northbound at 7 p.m. and southbound ...