Giants' Drop was a vast chasm in Charlottenlund on Trion, carved out of the rock by the Laima to focus their psychological powers. The distance to the bottom was in exact ratio to the distance between Trion and Cu Chulainn and the bottom itself was smooth and covered in an alloy several metres thick.
Long after the Laima left N-Space, the Drop became a popular tourist destination for the Trions, known as one of the Five Wonders of the World. The Central Museum was built there. A tour guide would tell the visitors what was known about the Drop and lead them over a magnetic field giving them a view down below. The Tourist Board removed the lights at the very bottom due to them causing vomiting and a number of heart attacks.
Vislor Turlough visited the Drop whilst touring the Trion museums. There, he was reunited with Juras Maateh, who was working as a tour guide. (PROSE: Turlough and the Earthlink Dilemma)