*Pfalzgrafenstein Castle (German: Burg Pfalzgrafenstein) is a toll castle on the Falkenau island, otherwise known as Pfalz Island in the River Rhine near Kaub, Germany. Known as "the Pfalz," this former stronghold is famous for its picturesque and unique setting.* https://en.wikipedia.org/wiki/Pfalzgrafenstein_Castle
Experimental, reconstructed from various 4K drone footage only