See the shocking arsenal stockpiled inside Adam Lanza's lair

See the shocking weapons arsenal stockpiled inside Adam Lanza's lair. Lanza unleashed the deadly rampage at the Sandy Hook Elementary School in Newtown, Conn., in Dec. 2012.

Authorities say Adam Lanza killed his mother at their home and then opened fire inside the Sandy Hook Elementary School in Newtown, Conn., killing 26 people, including 20 children, before taking his own life, on Friday, Dec. 14, 2012. (AP Photo/NBC News)

Authorities say Adam Lanza killed his mother at their home and then opened fire inside the Sandy Hook Elementary School in Newtown, Conn., killing 26 people, including 20 children, before taking his own life, on Friday, Dec. 14, 2012. (AP Photo/NBC News)

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