Old groynes overgrown with algae, Rantum, Sylt

algae alga aquatic macrophyte aquatic plants aquatic plant botany buildings building central europe coastal areas coastal area coastal region coast protection coasts coast conference center congress halls congress hall convention centers convention center convention centre copy space cultural centers cultural center cultural centre cultural sites cultural site deserted drearyness empty europe event centers event center event centre event halls event hall exhibit hall exhibition hall exhibitions exhibition expo fair hall fair german federal republic germany gray grey groin groynes groyne halls hall heritage buildings heritage building hydrophyte hydrophytic plant islands island middle europe monochromatic monochrome monotonous nature nobody no one no people norddeutschland nordfriesische inseln nordfriesland northern friesland northern germany north frisian islands north frisian north frisia north germany old overgrown pile pilings piling plant covers plant cover plants plant poles pole protection rantum river structures river structure river works schleswig holstein stake sylt trade fair hall trade show uninhabited venues venue water plant wave breakers wave breaker waves wave wooden poles wooden pole wooden