Rubjerg Knude Lighthouse, Denmark

Started in 1899, this lighthouse located in Northern Denmark was first lit on December 27^th, 1900.
It was built 60 metres above sea level and was operated via gas from a gasworks on the site in 1908.
It had ceased operations in 1968 and the two buildings were converted into a cafeteria and a museum respectively.
Despite numerous rescue attempts, the buildings and lighthouse were eventually abandoned in 2002 due to the constant shifting sands.
The smaller buildings by 2009 were so badly damaged by the constant erosion that they too were later removed. While still sturdy and weathering the ferocious effects of nature, the lighthouse is expected to fully succumb to coastal erosion in the next decade.
In this digital age where nearly everything can be held under a microscope and keeping things a secret is proving to be a difficult task, these buildings, with some of their histories lost to time, remind us that there are still some mysteries left in the world.
And because of our need to look under every rock for an answer to satisfy our curiosity, these ruins and buildings of the past will always be a subject of our undying interest.
Perhaps it is a good thing that  these structures would soon be lost; their secrets will go with them to their grave and we will be captivated by our imagination of what these secrets may be.