There is no reason why he should not . . . take her waltzing in Strauss’ Vienna or to the theater in Shakespeare’s London – as well as exploring funny little bars in Tom Lehrer’s New York or playing tag in the sun and surf of Hawaii a thousand years before the canoe men arrived.
Brave to Be a King, a time-travel story by Poul Anderson. I wonder, would he have said “Tom Lehrer’s New York” in any year other than 1959?