This is a funny moment for Greece and Greek geography/mythology to show up. Most other references to such things were part of the Players repertoire – and that was largely from the point of view of the Trojans. We see the blood covered Greek laying waste to the woeful royal family in the player’s speech. But that’s the only other Greek reference I can think of offhand.
This is a Christian Denmark – we are living with Christian symbols and rules here – but Laertes calls to mind a tall mountain in Greece – a mountain built on top of another mountain to get closer to the gods on Olympus.
Maybe Laertes is longing for another paradigm, a way to get closer to Heaven together with his sister.