From Exodus3000 Wiki

Ruins are the remains of what used to be a settlement or an outpost.

When a player finds a ruin, they may look what is inside. Ruins contain Mars Dollars, but they leave equal to less than what volcanoes contain. Like volcanoes, jackpots can be found, and the amount of Mars Dollars found in a jackpot possibly ranges from 80 to 150 MD, and unlike volcanoes, there is no way to lose Mars Dollars when looking through a ruin. There are fewer ruins than volcanoes, though.

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