High Contrast Light
Summer sun is very strong and produces strong shadows. We can see into these shadows because our eyes almost instantly adjust between the light and shadow. Our camera sensors, film and the paper we print photos on can't see detail in both, so we have to find ways of changing the light to shade ratio before we photograph.
On a small scale this can be achieved. With large scale scenes however it is often best to wait till the light is softer like early or later in the day. You can use a reflector like a white card or silver foil to reflect light into the shadow, thus reducing the contrast and producing a pleasing image. Alternatively you can reduce the light on the sunny side of the object by screening it with a semi clear plastic bag or white translucent fabric or similar.