> Unknown Bridges

(author: William Robinson Leign/"Visionary City”, 1908)

> Unknown Oasis

(author: julian399)

> Unknown Vertical City

(author: Grant E. Hamilton/1895)

> Unknown Misty City

(author: Antifan-Real)

> Unknown Swimming Pool

(unknown source)

> Unknown Industrial District

(author: jarling-art)

> Unknown Prague

(author: merl1ncz)

> Unknown Coastal City

(author: Antifan-Real)

> Unknown Sunset

(author: Forcg)

> Unknown Eschitecture

(author: Maurits Cornelis Escher)

> Unknown Hong Kong

(author: Adimono)

> Unknown Clock

(author: Cornelius Dämmrich)

> Unknown Labyrinth

(taken from a Skoda advertising)

> Unknown Desert City

(author: ROAD Barcelona)

> Unknown Inception

(author: Fadi Yaish)
(taken from Trust Me I'm an Urban Planner) 

> Unknown San Francisco

(taken from The Fifth Sacred Thing)

> Unknown Skatepark

(taken from Mundo Psicadélico) 

> Unknown Flood

(taken from Mundo Psicadélico) 

> Unknown Cathedral

(author: Frederic St. Arnaud)