A harbour of a different kind. This one is not for boats, but for a zeppelin or an airship.

The bit of redstone I used is for lighting at night, which turns off during the day using a daylight sensor.
 

Instructions:

In the middle of the tower there is only one staircase to the very top.


Then I have for you still a comparison picture - day - night, so that one has seen once the lighting.
 

And another picture from the side to see the landing stage from the construction.