The city was founded 2100 years ago by an order of monks looking for a place for their purpose, a grand temple of learning and knowledge as well as more esoteric possibly nefarious means.This particular order had a very specific goal in mind and took many years to find the perfect location. A Crescent shaped natural harbor with shear cliffs made of granite / obsidian / and columnar basalt stretching around a 6 mile circumference. with towering cliffs over 200 feet with a powerful waterfall still eroding this natural harbor.
This is an example image to give you an idea of how it may look. http://cdn.zmescience.com/wp-content/uploads/2012/11/basalt22.jpg
From what historians are able to piece together from the scant knowledge that remains. The temple took 200 years to build suspended over the harbor From the blocks and granite coverings of the temple matching certain locations from the Spiraling Road, The main hewn road in the walls of the cove that leads from the Clifftop down to the harbor.
The chains themselves are a curiosity as the method of creation is no longer known. The support chains for the temple were hewn from obsidian and some material still unidentified. The curious properties of this chain from testing of discarded smaller pieces is the material is nigh indestructible and the locals describe the phenomenon known as Falselight. Once the sun has set the chains glow, a second sunset of sorts until it fades an hour later typically.
The support network of chains are anchored deeply within the walls of the cliffs with each major point having a guardhouse with entrances towards the temple proper. (looks like this very very roughly http://vignette4.wikia.nocookie.net/fringe/images/b/b1/600px-ButterflyGlyph.jpg/revision/latest?cb=20090407234348 )
Two support chains lead to the waterfall diverting water to sustain the temple complex
The temple proper looks similar to this http://ravensworld.wdfiles.com/local—files/thay/karrnath_towerofthetwelve.jpg just less lightning, more chains, and a smaller ziggurat underneath.
The chains all lead to the temple itself with supporting gardens and buildings for forges, etc. Mills with water grinding.
Only a hundred years after the city started bustling and hustling to their own tune they had royalty visit after discovery of the monks squatting on their coast. After aggressive diplomacy the monks were no more. The royals began building a large castle complex bridging over the waterfall for their new main capital. Queue the next several hundred years. Lineage after lineage/
The location was ideal. A natural harbor with enough space to hold a fleet and support wide trade routes from coastal cities and exotic islands. The wide Angevine river feeding the waterfall carries lumber and skiffs with commodities further inland.
All these materials attracted artists, craftsmen and before you knew it people were building within the cliff walls, the harbor front, suspending whole districts by steel chains. Shanty towns and upper class districts were strung from cliff to cliff. These districts descended until the King halted all construction a 100 feet above the harbor proper.
All these years rolled by and the needs of the city expanded beyond the cliff walls. Farms and estates arose in a half ring around the city proper. A wall was erected a half mile from the city. The kings woods take up a major portion just behind the castle proper.
Over time more walls were erected, the first a mile out from the original, more robust in the first. Then one more wall two and a half miles out. There are three main cobblestone roads lead into the city proper. Small hamlets exist to support the farming community with the river being re-routed in parts to supplement the farms.