Pentagon 9/11 monument

The Pentagon and 9/11-Memorial - darkometer rating : 3 - The Pentagon is the nerve centre of the USA 's military and as such it's probably the spot with the highest concentration of power in the world (at least with regard to power in the sense of military capability – the political power centres lie in nearby Washington D.C. ). The buildings was thus a prime target for the terrorist attacks on 9/11 , when an airliner was steered into the side of the west facade. The event is now commemorated by a sprawling monument right next to the Pentagon. > More background info > What there is to see > Location > Access and costs > Time required > Combinations with other dark destinations > Combinations with non-dark destinations > Photos More background info: Located in Arlington, just outside Washington D.C. proper (but only just) the Pentagon is the administrative nerve centre of the USA 's military might. Over 25,000 people work here. The building, constructed during WWII between 1941 and 1943, is aptly named the Pentagon after its five-sided layout – chosen to make the distances between any two points within the building as minimal as possible, in order to streamline internal logistics. It's the largest office building in the world by floor space, almost twice that of the Palace of Parliament in Bucharest , which thus comes a distant second. But owing to the clever layout the Pentagon looks much less imposing when you actually stand in front of it.