New York is the state with the most (270), and New York City, with 114 designations, is the city with the largest number of designations. Of the states, North Dakota has the fewest designations with seven.
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Knap of Howar, OrkneyThe UK's oldest surviving building is this Neolithic farmstead on the island of Papa Westray in Orkney.
The Saltford Manor is a stone house in Saltford, Somerset, near Bath, that is thought to be the oldest continuously occupied private house in England, and has been designated as a Grade II* listed building.