2:185 The month of Ramadhan [is that] in which was revealed the Qur'an, a guidance for the people and clear proofs of guidance and criterion. So whoever sights [the new moon of] the month, let him fast it; and whoever is ill or on a journey - then an equal number of other days. Allah intends for you ease and does not intend for you hardship and [wants] for you to complete the period and to glorify Allah for that [to] which He has guided you; and perhaps you will be grateful.
From the above ayah, the obligation to fast during Ramadan is clearly waived while one is travelling. Less clear, however, is what exactly constitutes a "journey."
Given as an example, I decide to travel to another city to visit family, and intend to stay at that city for a span of days. The trip between cities is long enough that it can easily be considered a journey, one in which fasting is unnecessary. The point of contention is whether or not the fast becomes obligatory again upon reaching the destination.
So the question lies thus: Does an extended visit in a distant city still count as a journey?
I know there is a significant difference of opinion among the scholars regarding this issue. As such, while scholarly opinions (from any school) are welcome, what I am particularly interested in is the actual evidences used to derive these opinions.