Abstract: A retaining wall utilizes an ordered array of modular blocks each having a horizontal cross-section defining a double "T" shape, the top of the double "T" defining a vertical planar member having a horizontal length greater than the vertical height with the stem of each "T" defining a generally planar leg member having a height the same as the vertical planar member. A hole is provided vertically through each leg distal the vertical planar member and adapted to receive a tension rod for tying the assembled blocks together. The "T" shaped blocks are vertically arranged in staggered courses with the holes of the legs in the course above vertically aligned with the holes in the legs in the course below. The lower end of the tension rod is adapted to be anchored in the concrete footing supporting the retaining wall.