A lighthouse is a tower, building, or other type of structure designed to emit light at night.
Lighthouses mark dangerous coastlines, and can assist in aerial navigation. Once widely used today they have been replaced by modern navigation (Gps).
Number of operational lighthouses has declined due to the expense of maintenance.
lighthouses are used in the past and the best example is intact Tower of Hercules at A Coruña, Spain this gives insight into ancient lighthouse construction.
A modern era of lighthouses began at 18th century.
And here are the most beautiful examples.
I do not know where this is located but it is a very nice picture from the Internet.
Here are two examples from my state.
Palagruza
This lighthouse was built in 1875.
Today it is used as a holiday apartment.
Porer
The Porer Lighthouse was built in 1833.
The island is so small that you need less than a minute to walk around it,the lighthouse guy is constantly stationed here.
Before modern strobe lights, lenses were used to concentrate the light from source.
Strobe light.
Lighthouse lantern room from mid-1800s,which uses lenses.
They differ by the color of the light and by the time of changing the darkness and the light.
The light can only be visible in some sectors or can mark the covered directions.
Each lighthouse has its own characteristics. the color of the light (flash), the permanence or periods of darkness and flash expressed in seconds and the visibility of the light expressed in the sea miles, as well as the visibility of the flash or the decay in certain sectors.
We can almost say that each lighthouse has its own personality.
