I left mainland Scotland to head out to the Outer Hebrides for one main reason, to visit the even more remote uninhabited island of St Kilda. I had a couple of days to spare before getting out to St Kilda, so while staying in Stornoway I took a day drive to drive to the most northern point of the Outer Hebrides. I had seen Port of Ness on Google Maps several months earlier and thought it was definitely worth a trip, (and it most definitely was) but while I was there I took a very short detour to visit the lighthouse, and the outstanding Callinash Stones on the way back to the excellent B&B back in Stornoway.
Butt of Lewis Lighthouse: www.undiscoveredscotland.co.uk/lewis/buttoflewis/
The Butt of Lewis is about as far north as you can go in the Outer Hebrides. According to the Guinness Book of Records it is the windiest place in the UK. Look West from here and there's nothing between you and North America: look north and it's open ocean all the way to the Arctic.
The lighthouse stands 121ft high and was built between 1859 and 1862.
Outer Hebrides: en.wikipedia.org/wiki/Outer_Hebrides