The City of the Gods was the central city on the planet Kobol in ancient times, said to be the birthplace of mankind and the place where the "gods and man lived in paradise" before the exodus of the thirteen tribes. Prior to the Kobolian 'calamity', the City of the Gods was once a populous city - filled with skyscrapers, highways, recreational parks, forums, temples, and had a twin river system running through it, as depicted in visions and the Sacred Scrolls.
Downfall and Subsequent Rediscovery
Ca. 2,000 years ago, Kobol was shaken by an unknown cataclysm, after which the remaining Twelve Tribes left their world for what is now know as the Twelve Colonies of Kobol. It is unknown if the city was destroyed in this cataclysm, or if it fell to ruin by abandonment, but upon it's discovery, the city and surrounding areas were all but reclaimed by nature; the roads having long been broken apart and buried, the buildings, bridges, and other city infrastructure have long since fallen to the ground, and the once flourishing rivers have given way to a swampy marsh. The only visible ruins belonged to what was once an Opera house, located at the base of a mountain range (TRS: "Kobol's Last Gleaming, Part I").
A vision of the city before its destruction...
...What's left nearly 2,000 years later.
The city as depicted in the Sacred Scrolls.
The remains of the city's Opera House.