A futuristic walled city on an island in an underground lake, connected by bridges within a vast glowing cave.

A high tech walled city on an island in the center of a lake. A taller tower is at the center of the city. Four fortified bridges, ninety degrees apart, connect the city to the shore. Many small pools and canals run back and forth within the city. The entire city and lake are located within a vast underground chamber. Small boats travel on the lake. See more