Govt. agcy. whose headquarters house the partially unsolved Kryptos sculpture

• Spook house?
• D.C. hush-hush group
• Its headquarters are in Langley, Virginia
• While Michael Hayden followed Porter Goss as current director of ___
• American spy org
• Org. headed by Mike Pompeo
• Langley-based org

Wiktionary Word definitions in Wiktionary
n. (plural of thecium English)