Doorway to Fortune

A village man accidentally uncovers an enormous energy doorway. A doorway that opens and closes at it's own will and is believed to be the home to a hidden gold treasure.
Legend has it that there is a crazy amount of gold hidden inside it's walls and that there is a passage inside of it leading to the treasure, but no one could find it ever.

The village man was tempted and agitated at the same time and he was yet to decide if he wanted to have a look inside.