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2. Keystone (architecture) - Wikipedia

   en.wikipedia.org/wiki/Keystone_(architecture)

   The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...

3. Retaining wall - Wikipedia

   en.wikipedia.org/wiki/Retaining_wall

   A basement wall is thus one kind of retaining wall; however, the term usually refers to a cantilever retaining wall, which is a freestanding structure without lateral support at its top. [2] These are cantilevered from a footing and rise above the grade on one side to retain a higher level grade on the opposite side.

4. Dunmere (Narragansett, Rhode Island) - Wikipedia

   en.wikipedia.org/wiki/Dunmere_(Narragansett...

   The cottage sits high on a large stone outcropping about 150 feet from Ocean Road. Narragansett Bay is 600 feet to the east of the building. This area also includes garden terraces, fountains, an artificial lake, two gazebos, a stone-arched bridge, stone retaining walls and a shingled stable block.

5. Rustication (architecture) - Wikipedia

   en.wikipedia.org/wiki/Rustication_(architecture)

   Rustication is a range of masonry techniques used in classical architecture giving visible surfaces a finish texture that contrasts with smooth, squared-block masonry called ashlar. The visible face of each individual block is cut back around the edges to make its size and placing very clear.

6. Corbel arch - Wikipedia

   en.wikipedia.org/wiki/Corbel_arch

   For the sake of comparison, a semicircular arch with wedge-shaped voussoirs maintained by a central keystone ("true arch"). A corbel arch (or corbeled / corbelled arch ) is an arch -like construction method that uses the architectural technique of corbeling to span a space or void in a structure, such as an entranceway in a wall or as the span ...

7. Mechanically stabilized earth - Wikipedia

   en.wikipedia.org/wiki/Mechanically_stabilized_earth

   The wall face is often of precast, segmental blocks, panels or geocells that can tolerate some differential movement. The walls are infilled with granular soil, with or without reinforcement, while retaining the backfill soil. Reinforced walls utilize horizontal layers typically of geogrids. The reinforced soil mass, along with the facing ...