The Grand Hotel on Mackinac Island. Longest front porch in the world. May 29, 2018June 18, 2018 [igp-video src=”” poster=”http://pagefillers.com/blog/wp-content/uploads/2018/05/32721986_1727380060683829_8096420575989202944_n-2.jpg” size=”large”] The Grand Hotel on Mackinac Island. Longest front porch in the world.