Burg Rheinfels

Burg Rheinfels was founded in 1245 by the Counts of Katzenelnbogen to control Rhine river traffic and levy tolls, and it withstood a major siege by an alliance of Rhenish cities in 1255, one of the few Rhine castles to successfully repel a large medieval attack, which contributed to its subsequent expansion into the largest fortress on the river. Over the following centuries successive owners enlarged the complex with extensive outer works, bastions, and a network of tunnels and mine galleries built for underground defense, reflecting the evolution of fortification techniques from medieval walls to early modern artillery defenses. French revolutionary troops largely demolished the fortress in 1797, and much of the stone was subsequently quarried by local residents for building material, leaving the extensive ruin visible today, far larger in footprint than most surviving Rhine castles despite its ruined state. A small museum near the entrance displays models reconstructing the fortress's original full extent, alongside archaeological finds, helping visitors interpret the sprawling ruins, while marked paths lead through the mine tunnels, dry moats, and bastion remains. The presentation is largely a self-guided ruin exploration rather than a restored interior tour, since so little of the original roofed structure survives, with information panels at key points explaining the successive building phases from the 13th to 18th centuries. The site remains one of the most extensive castle ruins in the Rhine valley and is included in the UNESCO-listed Upper Middle Rhine Valley cultural landscape.