Mother of presidents
Presidential Resting Places: Only 3 sites have the remains of 2 presidents: 1 at Quincy, Mass., 1 at Arlington, & 1 in this state capital
Even if you didn't know the answer (and I didn't), I'd have thought Richmond (Virginia! Mother of presidents!) the first guess. But I was wrong.
Guesses were Albany, Boston, and Columbus .... What? Ohio is "mother of presidents" too? Huh. Who knew?
But Richmond is still the right answer.