Yuèshān-guan [ 月山館; Moon Mountain Hall ] is a private training activity near Seattle led by Mark Raugas that is centered around the cultivation of skill at traditional approaches to Chinese internal martial arts passed down through Yin Cheng Gong Fa North America [ 印誠功法 ].

Yuèshān-guan is read as Gassankan in Japanese — I also maintain a practice of medieval Japanese sword methods drawn from the lines of Shinkage-ryū Heihō taught at the Hōbyōkan [ 宝瓶館 ] as informed by a continued study of internal martial arts.