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Washington DC is heavy populated, finding the pentagon would not be as easy as you think,
Having flown commercial into DC several times, no it is not that hard to find.
Perhaps you've been looking at the GPS screen too much, and not doing it the old fashioned way of looking out the window.
There's the river, it's next to the river.
There's the airport, runway 33 is pointed straight at the Pentagon like an arrow.
Arlington National Cemetery, a huge sea of green, is just to the north.
Easy to spot.