1
District Of Columbia Grotto
6304 Kaybro St,
Laurel,
MD
2nd Thurs. of even months at 7:30 p.m. Chevy Chase Comm. Ctr, Wash. DC, nssio.org
2
Baltimore Grotto
7600 Pindell School Rd,
Fulton,
MD
1st Wed. 8:00 p.m. UBMC Sondheim Bldg Room 1XX nssio.org
3
Franciscan Monastery
1400 Quincy St NE,
Washington,
DC
Reverend Father Godfrey Schilling tried to provide a place in the United States for people who do not have the time, money or good health to visit the Christian sights of old Europe. Beneath his church and monastery, in th... showcaves.com
4
Frederick Grotto
935 Bloom Rd,
Westminster,
MD
Last Thur 7:30 p.m., Mt. Araby Church, Araby Rd., Frederick, MD nssio.org
5
Fairfax Underground Network
7713 Shreve Rd,
Falls Church,
VA
A few meetings a year. Check with contact. nssio.org
6
Battlefield Area Troglodyte Soc
2961 Ellenwood Dr,
Fairfax,
VA
2nd WEDS 7:00 p.m., See Web site nssio.org