Rubjerg Knude Lighthouse, Jutland, Denmark

Rubjerg Knude at dusk in 2018, half swallowed by the shifting dune on Denmark's North Sea coast between Lønstrup and Løkken. First lit in 1900 some 200 meters from the sea, it was left only a few meters from the crumbling cliff edge by erosion, until in October 2019 engineers rolled the whole tower about 70 meters inland on rails. Its light is long out of service, but the dune walk to reach it is one of the strangest lighthouse visits anywhere.