Abingdon Montessori School Welcome to www.AbingdonSchoool.org. Abingdon Montessori School began in 1970, and is accredited by the Maryland State Department of Education. Just as no two children are exactly the same, no two Montessori schools are exactly alike. At Abingdon, we try to combine the wisdom of Dr. Montessori's theories of human development with a recognition of the qualitative and...