Let $G$ be a finite group and $H$ a subgroup. The interval $[H,G]$ is the lattice of overgroups of $H$.
It is an open problem to know if every finite lattice can be represented by such an interval (see here).
Here is a weaker question:
Question: Can the reversed lattice of $[H,G]$ be represented?
("reversed" means $180^{\circ}$ rotation)