Please answer the following question: The Indian Bar Trail Shelter in Mount Rainier National Park is a rustic shelter on the Wonderland Trail built by the Civilian Conservation Corps in 1940. The shelter features stone walls and a log roof structure to a design by the National Park Service Branch of Plans and Design under the supervision of Edwin A. Nickel. Measuring about 23 feet (7.0 m) by 26 feet (7.9 m) it is one of two CCC shelters remaining on the trail with the earlier Summerland Trail Shelter. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Building