Eye of the North

From Guild Wars 2 Wiki

The Eye of the North is a huge tower of unknown origins in a remote area of the Far Shiverpeaks. It is a large building in which there are two known rooms - the main inside of the tower, which has a large amount of space, and the Hall of Monuments. It is topped with a hollow spire, the uppermost part of which appears to be broken off or incomplete in construction. The Hall of Monuments is filled with commemorations of the deeds of a long-dead hero and a Scrying Pool.

Although locals avoided the Eye, the Ebon Vanguard made the Eye as their base of operations upon their arrival in the Far Shiverpeaks, and used it to strike out against the Charr Homelands. However, within the last two centuries the minions of Jormag drove out most of the creatures in that region of the Shiverpeaks, the Ebon Vanguard included.

The Guild Wars Wiki has an article on Eye of the North.