Records of fossils are substantial parts of a scientific approach in order to get a glimpse of the past's lifestlye, diet, biological makeup and living environment, among others. Remains or traces of organisms like plants, animals and humans from the past that have been preserved in soil layers or rock formations, normally some tens of thousands years ago.
Fossil records are important sources in learning history and means of verifying accounts.
Meanwhile, ruins are formerly only of interest to architects and engineers (along with some people who appreciates structural marvels of bygone days) but they are now considered vital parts of culture and art appreciation for their aesthetic apppeal. They are of particular interest to anthropologists and historians for their importance in the study of past towns, villages, structures and houses that denote human society state in a certain time period.
They are usually former buildings, houses, towns or places of worship, considered architecture and engineering marvels in their time but have suffered damages from normal weathering or war destruction, now being preserved and protected mainly by UNESCO's World Heritage Sites for serving as unique historical markers.