The Netherlands' most iconic engineering monument: a 32km arrow-straight causeway separating the salt Wadden Sea from the freshwater IJsselmeer, completed in 1932. This 130km route runs from Den Oever in North Holland across the Afsluitdijk to historic Frisian harbour towns, returning via a coastal loop. Crosswinds can be ferocious — ride leaning into the prevailing southwesterly. Best on a clear day; visibility extends to both seas.
Clone it to your planner, customize dates and stops, then ride. All free.