The Willey Brook Trestle in Crawford Notch, New Hampshire, is a historic railroad bridge that dates back to the 1800s. Originally built in 1875, it crosses a deep gorge where the Willey Brook flows. During World War 1, soldiers were assigned guard duty to protect important sites like this trestle from potential sabotage. Today, visitors can still see the remnants of this history, including carvings in the nearby ledge, adding an extra layer of intrigue to this scenic spot in the White Mountains.