Accessing Questions via your own Newest Answers (or by Votes or Activity) is easy to do using functionality already present on your user profile (see below).
However, I have not yet found a similarly easy way (i.e. two clicks) to find the Questions which have the Newest Answers anywhere on an entire Stack Exchange site (i.e. not just for a single user via their profile) .
Is there one?
As mentioned in a related Q&A (There should be a filter for new answers?):
The activity tab is a poor way to track new answers. It contains edited questions, new questions, and even questions bumped by Community.