Pentagon built on Hell's bottom...

Pentagon.... 
Building started on 9/11/1941 opened on 1/15/1943
Or 1 year, 4 months, 4 days excluding the end date.
"Mark of the Beast" = 144 (English Ordinal)

Pentagon built on Hell's bottom... 

"Hell's Bottom" - Reborn
By Kaleb M. Dissinger, Army Heritage MuseumJanuary 5, 2010

As the United States military machine ramped up with the onset of World War II in 1939, so too did the manpower and infrastructure to support it. At the time, the War Department was spread throughout seventeen buildings in Washington, D.C., which caused some difficulty for the roughly 24,000 civilian and military personnel who worked there. And it was estimated that by the middle of 1942, the workforce would reach 30,000. As a result, in July 1941, President Franklin Roosevelt requested several new buildings be built in order to house the expected increase in department employees. Rather than add more office space to an already congested city, a plan was suggested to move the site across the Potomac River, which would still offer ease of travel to and from Washington. By August of the same year, a bill with authorization for funding and construction had been approved by Congress. 

U.S. Army Brig. Gen. Brehon B. Somervell headed the operation of design and construction of the building, which began on Sept. 11, 1941. And although critics of the plan called it Aca,!A"SomervellAca,!a,,cs FollyAca,!A?, his ability to conceptualize and implement the project would later earn him the unofficial title of Aca,!A"Father of the Pentagon.Aca,!A? Because a certain level of self-induced rationing was already in effect by late 1941, the War Department opted to have the building made primarily of steel-reinforced concrete, rather than vice-versa. This decision allowed much needed steel to be diverted to the upcoming foreseen war effort. Another method of saving vital materials included utilizing wide ramps as a means to move up and down levels rather than installing costly elevators. The plan of the building was in the shape of the five-sided geometric design, a pentagon -- hence, its name. Not only was this ideal for the plot of land that the building would occupy, but the developers also wanted to make movement the most efficient possible within a building that would ultimately be wider than the Empire State Building was tall. The structure would be only five stories high, with another two underground levels and would have five concentric rings situated on the inside. The layout of the halls and corridors allowed walking from one side of the Pentagon to the other to take only about ten minutes. A five-acre open courtyard (later known as Aca,!A"Ground ZeroAca,!A?) in the center of the building housed an eating establishment and an area for relaxation.

The Pentagon would take only sixteen months to complete: an amazing feat which at times boasted 15,000 workers on a 24-hour shift. The Pentagon was officially opened on Jan. 15, 1943, with the total cost tallied at $83 million. At the time, it was by far the largest office space in the world. It eclipsed the Empire State BuildingAca,!a,,cs floor space by three times, contained over seventeen miles of corridors, and would house roughly 33,000 War Department employees before the warAca,!a,,cs end. While critics disparaged its size, location, and cost early on, the Pentagon was an engineering marvel that would prove its worth not only during the Second World War but for decades to follow. Today, along with the other uniformed services and the senior leadership of the Defense Department, the Department of the ArmyAca,!a,,cs headquarters calls the Pentagon home. 

As for Somervell, before his project was completed, he was made a lieutenant general in command of the Army Service Forces, which handled all Army logistics in World War II. He retired in 1946 with the rank of general. One of his principal subordinates in overseeing construction of the Pentagon, Col. (later Lt. Gen.) Leslie R. Groves, Jr., would go on to head the Manhattan Project that developed the Atomic Bomb. 


https://www.army.mil/article/32482/hells_bottom_reborn

"Hells bottom" = 42 (Full Reduction)
"Hells bottom" = 141 (English Ordinal)
811 is the 141st prime number
"Hells bottom" = 156 (Reverse Ordinal)

rom and including: Thursday, September 11, 1941
To, but not including Friday, January 15, 1943

Result: 491 days
It is 491 days from the start date to the end date, but not including the end date.
Or 1 year, 4 months, 4 days excluding the end date.
Or 16 months, 4 days excluding the end date.
Alternative time units
491 days can be converted to one of these units:
42,422,400 seconds
707,040 minutes
11,784 hours
491 days
70 weeks and 1 day
134.52% of a common year (365 days)

George Edwin Bergstrom, architect of the Pentagon, was a Freemason. His name is listed publicly.
George Bergstrom (March 12, 1876 – 1955) American architect of Norwegian heritage noted for his design work on the Pentagon.
Denslow, William R. (1957). 10,000 Famous Freemasons. Columbia, Missouri, USA: Missouri Lodge of Research. (digital document by phoenixmasonry:
https://ipfs.io/ipfs/QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco/wiki/List_of_Freemasons_(A_-_D).html