Protectives:
Ideal Albedo. You perfectly diffuse incoming radiation, granting you immunity to light and radiation damage of any kind.
Architecturals:
The Wide Bridge. Take two stretches of coastline of equal length but differing position. (How different depends on the power of the spell - low level ones might be limited to crossing oceans or lakes, high level ones might span interstellar space or planes.) Hence forth, anyone stepping on to the water at one shoreline can, if they desire, continue to stride across the water as though it were solid land, passing through a fantastical gateway to the corresponding point on the connected shore.
The High Tower. Enchant a building. (At higher levels, enchant an area or portion of space that affects all buildings within it.) That building can now, regardless of construction material, support itself and it's inhabitants and contents to any height; they are effectively weightless. The building will not collapse so long as even a single support, however fragile, remains.
The Low Pit. Create a hole in the ground of any depth, up to and including straight through the world. Regardless of structural stability, it will never collapse.
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