The Golden Gate Skyprison is a triple-max prison floating above the Republic of California

The premier military installation of the Atlantic Federation

The Mega Laser Station is a relatively low tech super weapon that can be built in the Cosmic Era

A gyroscopic space station harboring a secret super weapon

The Castles Avalon are the defensive bastions of the Atlantic Federation, fortresses to break the backs souls of any who would trespass against them

A major military installation of the Lunar Free State

mass produced pre-fab structures were intended to allow military forces to rapidly 'castle' through hostile territory and quickly deploy defense in depth when needed. This was a counterpoint to large sprawling military bases.

The War Academy is one of the Federation's ace programs.

Created ages ago, the Tower of Malice is a repository of evil, cursed artifacts, and the souls of the wicked

Locked in a geosynchronous orbit over Gdansk, a major spaceport of the New Hanseatic League, Raketenhaus Ader-Wissenshaft is the League's premiere weapons research and test facility.

The Fleet tending bases of the Federation fleet

Joint Operations Space Headquarters - Annex 1, also known as Joshua-1 station

Like a grim eagle upon it's nest, the great black block of Tannia Castle looks down upon the city of the same name. Despite the fact that some of those brought within it's walls never come out again, the castle is still looked upon well by most of the city's inhabitants, a place of protection rather then a place of terror.

The techno-fortress of the Brotherhood of the Land of Nod, and the heart of their organization

A semi mobile fortress placed in the mouths of rivers, bays, and other bodies of water up to several miles off shore

A hoary old tower that serves as the lair of a necromancer, but not is all as it seems.

It was said that the King fell from grace so abruptly that the earth opened up beneath his citadel so he could fall for eternity. This is exactly what happened...

Down it falls, a great concentric castle of dark stone. Cracked and broken, though upright, pieces large and small fall together in concert, frequently dashing against each other, or drawing apart to create wide gulfs to expose the hungry blackness below.

And in this tumbling castle, there sits a king, his head heavy with his crown, his hands clutching his throne in unending terror.

The octahedral space stations designed and built by the Atlantic Federation

The fort seemed like every small boys dream, but in fact it was a very well made magical prison, and the young prince only learned the truth when it was too late and the magic sucked him inside, his cries from his now inch high body too quiet to be heard.

I know a guy who says he found a tower in the woods and saw a man fall out the window - straight up!