I've read somewhere that most items that are built by professional engineers (think roads, cars, etc) are built with some kind of maintenance in mind. In other words, things that are built well are built knowing they will need some upkeep. Roads need repaving or widening, and cars need regular mechanical maintenance in my example.
Are there any objects/items that are built/designed specifically so they can be left alone with very little to no maintenance? Things that can be "set and forgotten" as it were?