Where will you find roads without cars, forests without trees and cities without houses?
In a travel guide. Travel guides may discuss significant roads, but not the cars on them; they may mention forests of tourism interest, but not the individual trees, and cities will generally be discussed in terms of tourist attractions, without mentioning private homes (except occasionally if associated with a famous denizen, or of architectural significance).
I think it will be:
On the map.
You could find these things
In the ocean
roads without cars
The Bimini Road is an underwater rock formation in the Bahamas
forests without trees
and cities without houses
The Gloomy Octopus has been discovered building a city (nicknamed Octlantis by the scientists studying it) in Jervis Bay south of Sydney, Australia
You can find it
In the Dictionary ?
In an Ant Colony
The tunnels are roads, many ants grow fungus for food (the forests), and the living/feeding spaces could be considered cities.