(Virginia)
Natural Bridge is a geological formation in Rockbridge County, Virginia, United States, comprising a 215-foot-high (66 m) natural arch with a span of 90 feet (27 m). It is situated within a gorge carved from the surrounding mountainous limestone terrain by Cedar Creek, a small tributary of the James River. Consisting of horizontal limestone strata, Natural Bridge is the remains of the roof of a cave or tunnel through which the Cedar Creek once flowed. (Ref: https://en.wikipedia.org/wiki/Natural_Bridge_(Virginia))