It seems that you have missed the necessary options for us to answer this question, so I had to look for it. Anyway, here is the answer. The remote town of Supai, <span>which sits at the bottom of the Grand Canyon, is known for its unusual distinction which is Mail Delivery by Mule. Hope this answers your question.</span>
All the ruling houses have a span of over 100 years. A interval spacing of just 5, 10, or 20 years would be a waste considering how long these time periods are.
