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Survivors, which join the civilization: Adds 1 Population to any one of your cities.
You can't, for example, get Writing if you haven't researched Pottery yet. Note that you can only receive a technology that is available to research at the time you visit the ruins in other words, all prerequisites for the technology must be met already.
Secrets of the ancients: Gives you a free Ancient Era technology. Evidence of Barbarian activity: Reveals location of one or more nearby Barbarian encampments. Note that the center of the revealed space is not the ruins tile, but somewhere 3-4 tiles away in a random direction. A crudely drawn map of the surroundings of the ruins: Reveals most of the tiles nearby. The possible rewards from activating an Ancient Ruin are numerous: This is a one-time bonus, after which the ruin disappears. When activated, Ancient Ruins give a reward to the owner of the unit. Alternatively, if a civilization's territory expands onto the ruins tile, it will also activate it. In order to "activate" an Ancient Ruin, a player needs to move any land unit (including a civilian unit) onto the tile that contains the ruin. Budding "contemporary" civilizations may learn a lot from these places, which will help them in their early stages. Ancient Ruins in Civilization V are remnants of extinct civilizations, mementos of past greatness and order amid the chaos of the wilderness.