Layers

Imagine without the foreground mountains… or maybe there IS a mountain range somewhere in the Great City: http://fc09.deviantart.net/fs29/f/2008/057/0/8/Fantasy_City___Closer_look_by_MiG_05.jpg

Tower Neighborhood

A pinnacle neighborhood built directly covering an entire heights neighborhood: http://lordoffog.deviantart.com/gallery/26931165#/d3esim5

Same with bridge to another heights area: http://lordoffog.deviantart.com/gallery/26931165#/d2oet8m

View from the Pinnacles

Oh Yes, this is totally a scene from one of the pinnacles of the city: http://browse.deviantart.com/?q=fantasy%20city&order=9&offset=24#/d31yf52

Stormy Pinnacles

A storm brews amongst the pinnacles: http://browse.deviantart.com/?q=fantasy%20city&order=9&offset=216#/d3lerup

Rooftop Rise

A heights district raised up above the rooftops: http://browse.deviantart.com/?q=fantasy%20city&order=9&offset=240#/d3eol10

Upper Mid Strata

A good perspective showing rooftops, roofs, and chasms: http://browse.deviantart.com/?q=fantasy%20city&order=9&offset=264#/d32ovx4

Even better: http://lordoffog.deviantart.com/gallery/26931165#/d37s0kn

Trickle-down Aquatics

An evening view of a water feature as it cascades down from a heights neighborhood, down to the rooftops, and down into a chasm amongst the roofs: http://browse.deviantart.com/?q=fantasy%20city&order=9&offset=264#/d26h128

Roof Strata Light

On bright days, the roof strata can be quite well lit like this: http://browse.deviantart.com/?qh=&section=&q=ancient+interior#/d1ftmw3

Roof strata interiors can, however, also be dim, even when there are skylights present: http://browse.deviantart.com/?q=skylight&order=9&offset=120#/d15uq62

Life in the Chasms

A little too high-tech looking, but structurally spot on: http://browse.deviantart.com/?q=fantasy%20city&order=9&offset=192#/d46nrf9

Warrens Cavern

Sometimes the warrens open up into large spaces. Here's a very nice warrens neighborhood. Please ignore the blimp. Note the chasms above:http://lordoffog.deviantart.com/gallery/26931165#/d48xmdy

Tumbledown Shop

Down in the underneath, this was once a prosperous shop in the sun some centuries ago: http://browse.deviantart.com/?qh=&section=&q=underground+ruin#/d4oasvw

But some of these ancient alcoves are still occupied, down in the dark, like this shop: http://browse.deviantart.com/?q=underground&order=9&offset=192#/d3cy0e2

The Way Down

Entering the Depths, most everything is in a state of crumbling decay: http://browse.deviantart.com/?q=underground%20ruin&order=9&offset=24#/d2fq7ry

Some people head into the Depths searching for adventures: http://browse.deviantart.com/?q=underground%20ruin&order=9&offset=24#/d1abwbk

Depths Stalls

Imagine ancient spells of light still persist in what were once stalls of a marketplace: http://browse.deviantart.com/?q=underground%20ruin&order=9&offset=120#/dcjx1u

Old Temple

Often the Depths have standing water that comes down from above during rainstorms or just as the result of sewage being shunted below: http://browse.deviantart.com/?q=underground&order=9&offset=96#/ducml8

Into the Earth

Below the city depths are the deeps, places that were actually under the original city. This place was a mine: http://browse.deviantart.com/?qh=&section=&q=underground#/d4ae7g3