One of the questions in the Pioneer Scout archer exam states that the ballista was invented thousands of years ago in Syracuse, a Greek town. In the archeologist exam, the Greek ruins of Wilusa and Sicily are mentioned. The exam also references the collapse of Bronze Age civilizations, also known as the Greek Dark Ages, was indicated by a lack of Greek writing.
Sofia Daguerre shares information about Greek mythological characters Arachne and Athena.
Poster depicting Poseidon, ancient Greek god of the sea
↑Appalachia audio tour station 7: "The next stop in our tour is the impressive Poseidon's Passage - so-named after the ancient Greek god of the sea, earthquakes, storms, and horses. The impressive stalactite and stalagmite to your left, known as the Trident, will one day come together to form a massive natural column. The natural cave water here is filtered through the cavern rock over centuries, and is pure enough to bathe a newborn child in! Cross the bridge to continue the tour. For legal reasons, we encourage guests to stay on the trail and away from the water."
↑Vault Dweller: "So I'm looking for... Arachne? All right." Sofia Daguerre: "It's got to be connected to A.T.H.E.N.A. Both are from Greek mythology. Arachne was a weaver, and a brilliant one. She challenged the Goddess Athena somehow and... well, she was turned into a spider. You know, like Arachnids. Right? Some versions of the story say she won, others say Athena won. I don't remember the details... and does it matter? I don't know, either. I know it's a stretch, but it's the only connection I can think of." (Sofia Daguerre's dialogue)