Terrain feature found anywhere on land tiles.
- Base yield - none
Mountain tiles are impassable to almost all units except air units. They provide nothing to cities other than the opportunity to build Machu Picchu, Neuschwanstein, and Observatories. Note that a city must be right next to a mountain (or mountainous Natural wonder) to build an Observatory, but both wonders can be built in a city within 2 tiles of a mountain (so long as that mountain is not a Natural wonder).
Mountains are usually great obstacles to movement, and can provide natural defensive barriers. Just be wary of Carthaginian players, who can negate their defensive properties after earning a Great General!
It may be advantageous to settle a city right next to a mountain so that you can build the above-mentioned wonders and building there. However, you shouldn't go out of your way to do so unless you're playing as the Inca - they can put mountains and adjacent hill tiles to really good use!
Mountains are impassable, except to air units, and Carthaginian units (after earning a Great General). They provide nothing to cities.