A retaining wall and block are described herein for use in landscaping, gardening and the like. The block is formed from concrete and has an uneven face to replicate layers of flat stone. An elongated groove in the top of each block provides for reception of mating studs of upper contiguous blocks. The elongated groove is sized to allow the blocks to be turned and moved depending on the type and design of the particular wall being constructed. The ends of the blocks are biased to allow easy rotation and placement when building a curved or circular wall. A filler is provided for placement within the elongated groove of the blocks in the top tier of the retaining wall to provide for a smooth, flush surface.