Atlantis

The ancient city thrives beneath the waves, leading the way in the use of what the inhabitants refer to as technomystics, the combination of technology and any form of magic. The barriers surrounding the city serve as homage to this ideal. The Relics protecting the city’s residents from the pressure of the water above and make it possible for air-breathing residents to walk through the markets.
  The city also evades all technological scans — submarines skate around her unaware, deep-sea submersibles used by scientists researching the sea’s abyssopelagic zones simply divert themselves. The Council of Nine guards their security secrets so closely; oaths binding current and former Councilors have kept current and former members schtum for centuries upon centuries. The additional fact that Atlantis has grown from an Athens-style city-state to a sprawling metropolis means the boundaries of the city have likewise expanded. How the city accomplishes moving the barriers safely remains top secret.
  Once one gains entrance to the city, the massive, transparent bubble holding up the ocean generally causes anxiety or fascination. In the abyssopelagic zone, most of the time visitors expecting scads of fascinating animals find themselves disappointed, unless they find anglerfish, tripod fish, and cusk eels amazing. Tours of the Outer Wall’s animal life include a carefully selected area where jumbo octopi gather for unknown reasons. (Maybe they find the tours as fascinating as the tours find them.) On rare occasions, the city’s treated to the spectacle of a sperm whale battling a giant squid. The entire city stops cold on those days. Everyone runs out of their homes and offices, standing in the street and gaping at the struggle between a massive predatory whale and its favorite meal. These battles often last for the better part of an hour, during which everyone sits outside watching, and dominate all idle chatter for months thereafter.
  The city sprawls out from the Old City’s boundaries in the center along spoke-like streets. Ring-style cross streets curve around the circular boundary of the Old City like ripples from a stone thrown into water. Clear visual differentiation exists between the Old City’s original boundaries, and the expanded metropolis. Unlike most land-built cities, the desired view turns inward rather than outward: the closer one gets to the Outer Walls, the taller the buildings get, rather than the opposite. Even the most distant high-rise buildings’ top floors go for a premium. The ability to see ancient bone white and painted polychrome marble buildings at the center of the city commands a staggering price.
  While Atlantis began as Theoi territory, millennia of growth the city has transformed Atlantis into a thriving, cosmopolitan metropolis. Shrines and temples of all faiths and religions dot the city outside the Old City’s boundaries. The single temple within Old City dedicates itself to Poseidon. Attempts by Scions of other Gods to consecrate space within those boundaries meets total stonewalling by the Council of Nine, who must approve any construction or modification within Old City’s limits, or any which might endanger the city’s protective boundary.