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Large Concrete Retaining Wall Blocks | ... the block creates enough slop to allow the blocks to make curved walls

from Better Homes and Gardens

How to Build a Retaining Wall

Some retaining-wall blocks have locking mechanisms that allow them to be built to about 4 feet tall without extra engineering. Because we used tumbled blocks with no locking mechanisms, we used a construction adhesive on alternate courses. Remember, with locking blocks, you can remove blocks and start over if you make a mistake. But adhesive permanently bonds blocks, so work carefully.

from Home Stratosphere

27 Backyard Retaining Wall Ideas and Terraced Gardens

A simple terrace created with wooden blocks, chicken wire, and large stones for a rustic look. The landscaping is simple and low maintenance.