Land:

The Winter Fortress: 

The Summer Fortress: A nice little ripoff Ethan made to annoy Remy and Vincent.

The Jungle: A deep dense jungle that covers the world, enriching the earth.

The Generators: Small buildings which are mostly underground. Within them new wizards are trained and obscurium is mined.

In Space:

The Galactic Arena: 

The Asteroid Field: One of many.