This seems to happen particularly with Wonders – suddenly the game will inform me that building has stopped on a particular building without any further explanation. The building is then converted into gold.
Why is this happening? How can I tell what has caused it (where do I look) and how can I prevent it happening in future?
Best Answer
When another civilization completes the wonder you are currently building, your progress will be refunded back to you as gold.
As for other buildings, its possible the building under construction has become obsolete.