Mr. DOUGLAS: This is the dirty little secret in the underground information business.

NPR: Pretexting Is Alive and Well in Corporate America

Believe it or not, you can actually visit the Forbidden Corner in Middleham, North Yorkshire, an insane amusement park infested with talking statues, shrinking rooms, giant statues, secret doors and endless underground labyrinths.

BBC: Britain��s most bizarre attractions

The EPA has subpoenaed Halliburton for the secret formula for the liquid chemical cocktail it pumps into underground rock structures so natural gas can be accessed through a process known as hydraulic fracturing or fracking.

FORBES: EPA subpoenas Halliburton over fracking

Among Wall Street's many mysteries--the secret deals, the hidden transactions, the devious schemes and swindles--are its underground societies.

FORBES: Magazine Article