YOU SAID:

whither are they vanished?

INTO JAPANESE

彼らはどこへ消えてしまったのです。

BACK INTO ENGLISH

It is gone to where they are.

INTO JAPANESE

それはどこに行った

BACK INTO ENGLISH

Where has it gone

INTO JAPANESE

それはどこへ行った

BACK INTO ENGLISH

Where did it go

INTO JAPANESE

どこに行くか

BACK INTO ENGLISH

Where to go?

INTO JAPANESE

どこに行く?

BACK INTO ENGLISH

Where to go?