Ok, this has been bothering me for a few months. There is a book series (I believe it was a trilogy) that I read about 15 years ago and for the life of me I can’t remember the name or author.
The plot is that a guy in modern times climbs into an earthen mound one day and it ends up being a portal to a different dimension, that is similar to ancient Earth times but everything is much more vibrant (colors, sound, beautiful people) and it’s fantasy/sci-fi and the people drink mead a lot (fermented honey wine).
This is all I can remember. Ring a bell, anyone?