Inspired by the question, "Shortest path connecting two opposite points on a cube":
Q. What does the cut locus with respect to one corner of a hypercube in $\mathbb{R}^d$ look like?
"The cut locus from a point $p$ on a surface is the closure of the set of all points that have at least two shortest paths connecting them to $p$."1
Here it is for $d=3$:
Cut locus with respect to vertex $0$ is a star-tree rooted at vertex $6$.
1Itoh, Jin-ichi, and Robert Sinclair. "Thaw: A tool for approximating cut loci on a triangulation of a surface." Experimental Mathematics 13.3 (2004): 309-325.