The exterior of the Colosseum is covered with holes. The truth about their origin is that the blocks used for the exterior of the building were held together by iron clamps. These iron clamps were taken out in later times (Decline of Rome) and reused for other purposes.
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it has gone through thousands of years and is very old that is why it is in ruins
Because it is a very old structure. It is also damaged because of the weather but most of all by the stripping of its marble and other materials by the medieval builders.
The upper part of the southern side of the Colosseum collapse in an earthquake in 1349.