These photos capture stunning views of some of the most epic cliff-side cities in the world. A cliff-side city overlooking a sea passage has a superior command of the surrounding waters and is virtually impossible to assault from the water. Cities on steep hills, on the other hand, might have been built there to defend from land-based aggressors or because of their proximity to important landmarks like rivers.
Wadi Dawan, Yemen
Veliko Tarnovo, Bulgaria
Pitigliano, Grosseto, Italy
Piodao, Historical Village Of Portugal
Manarola, La Spezia, Italy
Civita Di Bagnoregio, Italy
Azenhas Do Mar, Sintra, Portugal