Echo (formerly Castle Echo) is a set of sprawling castle and city ruins, which while uninhabited, act as the capital of Verdantia.

Upon the formal induction of Verdantia as a territory, the Verdantics wanted to choose a capital which exemplified their natural ideals. Castle Echo, a large complex in a state of disrepair, was decided as a prime candidate. Despite this, most of the territory's actual administrative work was done in Lantern Hall, and the Verdantic Council was wary of the impact large scale repair and development on their image and the natural landscape. it was decided to make the entire castle and surrounding area open to the public, and to allow the surrounding nature to overtake it as a statement against industrialization. They also began to refer to the city as simply “Echo”, which was not official but stuck in the public memory.