Treasury
The riches of your empire are kept in the treasury. A treasury can only store one artefact.
You need a treasury level 10 for a small artefact, or level 20 for a great one.Costs and construction time for level 1:
2880 | 2740 | 2580 | 990 | 4 | 2:13:20
Prerequisites
Main Building Level 10, Wonder Of The World