MMORPG.com: Grandville is described as a “vertical zone” – what do you mean by this?

Matt Miller: The height of the main structure in Grandville is awe inspiring and eclipses the size of any other structures in CoV (or CoH). The zone is about proving yourself to Lord Recluse, and as you work your way up the food chain in the Arachnos organization, you will also be working your way up the zone. You will literally progress your way up the zone and access new levels above you. By surviving the challenges set forth the higher you go in Grandville, you will find yourself under the direct scrutiny of Lord Recluse himself. One thing that players wonder is if a travel power like flight would be required in a zone like this. Don’t worry, there are elevators that can take you up and down safely if you don’t have the ability to go vertical on your own.