The Grand Hotel on Mackinac Island. Longest front porch in the world. May 29, 2018August 13, 2021 [igp-video src=”” poster=”https://pagefillers.com/blog/wp-content/uploads/2018/05/32721986_1727380060683829_8096420575989202944_n.jpg” size=”large”] The Grand Hotel on Mackinac Island. Longest front porch in the world.