Realms of the Ancients (2009)

Like all sets from the Master Maze range from Dwarven Forge this modular dungeon set is designed for use with 25 mm minatures, has a 1 inch grid integrated into the floor design, and come fully painted.

From the publishers website:

This limited edition set of 1,500 sets is the pinnacle of Dwarven Forge's artistry. It evokes a long-forgotten dungeon environment that is a favorite of many gamers. This is the first set in large series of RotA products that will be released in the next few years.

The Realm of the Ancients Set comes complete with these pieces:

2x 4” x 4” Intersection (with four wall inserts)
3x Short Passage Piece
8x 2” x 2” Floor Piece
2x 2” x 2” Floor Piece (more worn)
7x Straight Wall Piece
1x Straight Wall Piece (more worn)
1x Straight Wall Piece (with opening)
7x Corner Wall Piece
1x Corner Wall Piece (more worn)