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The letter played down any divisions between the District of Columbia and the intertwined communities of northern Virginia and southern Maryland, claiming they were all part of the same “supercity” and would all benefit from the new venture.

There to meet him was a gaggle of journalists from around the world who had assembled for the hitmaker's latest launch: a supercity packed with stunning architecture.

He has spoken about creating a “supercity” that spans from Baltimore to Richmond.

I’m not suggesting that we should build an American version of Saudi Arabia’s planned desert supercity just east of the Bighorn Range.

And in a paper published this month in Evolutionary Applications, she and a co-author also report that another separate, distinct pigeon supercity begins in Providence, R.I. and continues to Boston.