I"m shamed to say I didn't even realize there was a "Forsythia Dell" in Dumbarton Oaks until last week. Had I known, I would have waited for these pics before posting my ambivalent thoughts on Forsythia last week.
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That's not to say my opinion on Forstyhia has changed much. I still think it's overused, and doesn't contribute much to a garden after its bloom time. But this planting - an acre of Forsythia shared between Dumbarton Oaks and Dumbarton Oaks Park - does make a compelling argument for the genus.