An amusement park surveying system, comprising: an amusement park structure having a retro-reflective marker ; an emitter configured to emit electromagnetic radiation toward the retro-reflective marker ; a detector configured to detect retro-reflection of the electromagnetic radiation from the retro-reflective marker while filtering electromagnetic radiation that is not retro-reflected; and a control system communicatively coupled to the detector and comprising processing circuitry configured to: monitor the retro-reflected electromagnetic radiation from the retro-reflective marker against a reference signature of retro-reflected electromagnetic radiation from the retro-reflective marker stored in memory; identify differences between the electromagnetic radiation retro-reflected by the retro-reflective marker and the reference signature of retro-reflected electromagnetic radiation, including differences in position or orientation; and determine whether the amusement park structure has incurred degradation due to mechanical stress, or environmental stress, or both, using the differences between the electromagnetic radiation retro-reflected by the retro-reflective marker and the reference signature of the retro-reflected electromagnetic radiation. an amusement park structure having a retro-reflective marker ; an emitter configured to emit electromagnetic radiation toward the retro-reflective marker ; a detector configured to detect retro-reflection of the electromagnetic radiation from the retro-reflective marker while filtering electromagnetic radiation that is not retro-reflected; and a control system communicatively coupled to the detector and comprising processing circuitry configured to: monitor the retro-reflected electromagnetic radiation from the retro-reflective marker against a reference signature of retro-reflected electromagnetic radiation from the retro-reflective marker stored in memory; identify differences between the electromagnetic radiation retro-reflected by the retro-reflective marker and the reference signature of retro-reflected electromagnetic radiation, including differences in position or orientation; and determine whether the amusement park structure has incurred degradation due to mechanical stress, or environmental stress, or both, using the differences between the electromagnetic radiation retro-reflected by the retro-reflective marker and the reference signature of the retro-reflected electromagnetic radiation. monitor the retro-reflected electromagnetic radiation from the retro-reflective marker against a reference signature of retro-reflected electromagnetic radiation from the retro-reflective marker stored in memory; identify differences between the electromagnetic radiation retro-reflected by the retro-reflective marker and the reference signature of retro-reflected electromagnetic radiation, including differences in position or orientation; and determine whether the amusement park structure has incurred degradation due to mechanical stress, or environmental stress, or both, using the differences between the electromagnetic radiation retro-reflected by the retro-reflective marker and the reference signature of the retro-reflected electromagnetic radiation. <EOS>