(Washington)
Crawford State Park Heritage Site is a 40-acre (16 ha) Washington state park located 11 miles (18 km) north of Metaline on the Canada–United States border in Pend Oreille County. The park preserves Gardner Cave, one of the longest natural limestone caves in the state. The cave is approximately 2,072 feet (632 m) feet in length and has stalactites, stalagmites, rimstone pools, and flowstone. The park is open and offers cave tours on a seasonal basis. (Ref: https://en.wikipedia.org/wiki/Crawford_State_Park_(Washington))