The building was built in the timber-frame fashion, in which the large posts and beams are fitted carefully and joined with large wooden pegs.
http://www.courant.com/news/connecticut/hc-marteka-winding-trails-center-0510-20130509,0,3515710.column
http://www.courant.com/news/connecticut/hc-marteka-winding-trails-center-0510-20130509,0,3515710.column