Our Conan Guild city is located in Poitain, Instance 21 but any AoC NPC near the gates of Potain, Purple Lotus Swamp or Lacheish Plains will teleport you to the guild city directly. The guild city has three levels or Tiers. Each tier is a huge project to finish and requires the entire guilds help in order to collect the money and resources needed to build each one. Each Tier gives the guild members special bonuses and it will also be atttacked from time to time by hostile NPC groups so we should get decent xp for defending the city. We are just starting the gathering process for the Tier 2 city now in order to begin construction.

Here is what Funcom has to say about the use of the city.
"Some buildings are there to support crafters and grant access to upper-level crafting recipes, as it’s impossible to build a siege engine without the mighty Engineer’s Workshop.

For more concrete benefits, several of the buildings grant benefits to all members of a class or archetype in your guild. Build a Temple and your priests will all grow tougher, while a Thieves’ Guild will help all your rogues get sneakier and stabbier.  “But how?” you cry.  We’ve consulted with the darker powers in Development—Jayde—and he gave us some detailed info on how some of these buildings will work.

The most common bonus available to players through the player cities will be the passive and/or feat based statistical bonuses for owning a Keep or other “archetype” buildings. These include: The University (Magic Rating), the Temple (Magic Resists), the Barracks (Defense Rating), and the Thieves’ Guild (Attack Rating). Additionally, the Keep building will have a generic bonus to Health Points, Mana Points, and/or stamina points.

Furthermore, these bonuses will increase based on the tier of each building, so a guild that puts in the effort to build a massive, powerful city will receive massive, powerful bonuses, the better to lord it over their friends and enemies."