Where Did John Take Mary?

Our Lady lived wherever he did. So, at first in Jerusalem, probably on Mount Sion, and then perhaps later in Asia Minor where he ministered and where he died. The ancient Western and Eastern tradition favor the former, and the more recent Western tradition has also the latter opinion.

There is a popular shrine of the house of Our Lady and St. John in Ephesus in modern-day Turkey that is based on revelations given to Bl. Anne Catherine Emmerich, but the Fathers and the ancient liturgies show Our Lady ending her earthly life in Jerusalem, where there are shrines, both Catholic and Orthodox, to her Dormition. Of course, they could have been in Ephesus and then moved back.