Yes, the process of nature breaking down complex objects and recycling them is a fascinating topic. With organic materials such as timber the process is readily observable. Even things like plastic or other petroleum-based products are broken down and go back to circulation eventually. The process is orders of magnitude slower, though.

No material is safe from degradation anywhere. Such is the second law of thermodynamics: enthropy will always increase in a closed system. The universe is a closed system as far as we know. Whatever complex order exists on Earth and particularly its ecosystem and the technosystem we humans have created exists only because pairs of hydrogen nuclei in the Sun pair up to form helium nuclei, a system in a state of lower level of energy than the original helium nuclei. In the end, the universe will end up in a state where all energy is low-level waste heat at the same temperature incapable of driving any process.