Lighthouses
Ahırkapı Lighthouse (Ahırkapı Feneri)
![Lighthouse Ahırkapı Lighthouse, Istanbul](http://ps7.lpsphoto.us/170409/093912l.jpg)
The first lighthouse on the coast of Constantinople appeared after the shipwreck of a merchant ship that ran aground in 1755. At the direction Sultan Osman III built a tower with a light source visible for three miles (read more )
Irbensky lighthship, Kaliningrad
![Irbensky lighthship Irbensky lighthship, Kaliningrad](http://ps8.lpsphoto.us/180902/125922l.jpg)
Floating lighthouses are used to protect dangerous places on navigable fairways in the open sea-underwater rocks, where the construction of stationary lighthouses is impossible or very expensive (read more )