Portland Breakwater Light.......

A favorite of mine

....better known as Bug Light, is a small light in Portland Harbor.  It's known for it's unusual architecture in the lighthouse world.
  The first light on this spot was constructed in 1837 because of damage during a huge storm in 1831.  Construction consisted of an 1800 foot breakwater with the light at its end.  The breakwater was not capped and there was no "keepers house" at the light so during winters when the rip rap breakwater was icy the keeper had to crawl out on his hands and knees. Ouch! The first light was made of wood, as were many at the time.
  The present structure was built in 1857 of iron.  The light is modeled after the Choragic Monument of Lysicrates in Greece.  The light is 24 feet tall from the base to the tip, and 12 feet in circumference.
After the initial building a small house was added for a short period of time, and the breakwater was shortened and capped.
  See http://lighthouse.cc/portlandbreakwater/history.html for a full history and more photos.

In the 1880's with house.

The sixth-order lens

The first structure.