What is the opposite of fortress

Synonym details for 'bastion · fortification · bulwark · ...'

dateusermodification 2013-01-03 23:10 old Joe Weir (obsolete) || level = raised 2013-01-03 23:10 old Joe Bastion · Fortification · Bulwark · Stronghold (outdated) · Fortress · Fort · Fortification · Weir (outdated) (def.) · Defense system || visible || categories = military 2010-07-20 17:08 Synonym eater approving: construction building ... is a generic term for Bastion Fortification Bulwark ... 2010-07-20 17:08 Synonym eater Bastion · fortification · bulwark · fortress · fortress · fort · fortification · fortification || visible || categories = military