Here are some examples:
* "Whence did you come?" (Meaning: From where did you come?)
* "The river flowed forth, whence it had begun." (Meaning: The river flowed forth from the place where it had begun.)
* "Whence this sudden change of heart?" (Meaning: From what cause or reason does this sudden change of heart come?)
While "Whence" is still understood, it's less common in everyday speech. In most situations, "from where" or "from what place" would be more appropriate.