Location is Virginia, USA
They seem to last all summer
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It looks like some kind of Lobelia. A close up of the flower itself would be very helpful.
I believe it is a Cardinal Flower:
This 1-6 ft. perennial has showy, red flowers in 8 in., terminal spikes. Each flower has three spreading lower petals and two upper petals, all united into a tube at the base. Erect leafy stems, often in clusters, with racemes of flowers resembling flaming red spires. The lower portion of the erect stem is lined with lance-shaped leaves.