Are There Secret Underground Bases In The Eastern U.S.?

Some ufologists and investigators believe unknown underground facilities exist in the eastern corridor of the United States…possibly short distances from large population centers. My question is: if these bases do exist, are any used for non-human and/or human experimentation and research? Is there another Dulce Base or Manzano Mountain hidden away in the Appalachians? I’ve listed the known underground facilities in the U.S. Mid-Atlantic region including those around the Nation’s Capital for reference:

The White House has a very large, deeply buried facility underneath it…an elevator in the White House gives you access straight down into the recesses. It is believed that 17 levels exist. Washington, D.C. has a expansive labyrinth of tunnels beneath it. Some of the tunnels are publicly known, such as the Metro tunnels and the underground train tunnels that members of Congress use to travel from their office buildings to the Capitol building.

Fort George G. Meade, near Laurel, Maryland, midway between Washington, D.C. and Baltimore, Maryland there is a huge underground system. Fort Meade is operated by the U.S. Army, but the National Security Agency (NSA) has its largest, publicly known operations center there. The NSA has literally acres upon acres of super computers underground at Fort Meade, stacked level upon level…a gargantuan subterranean stack of hi-tech digital pancakes. Continue read, Phantoms and monsters