Diez reveals two distinct sides: its architectural and collection history, and the Aar, which shapes the townscape. The rerouted river flows like a canal through the new development; three bridge arches span it.
Culture through collections and architecture
The historical collection of Diez is presented to the public across four floors at the Museum in Count’s Castle. Its timeline spans Devonian fossils around 380 million years old to early modern electrical engineering. Interactive exhibits invite visitors to touch, listen and smell, as well as conduct their own experiments. Natural history and the history of technology are thus brought together in one collection, alongside a range of ways to engage with the exhibits.
The Collegiate Church dates from the late 13th century. Its architecture reflects the transition from Romanesque to Gothic; it also serves as the burial church of the Counts of Diez and the Princes of Nassau-Diez. Architectural history and dynastic remembrance come together here.
The Nassau-Orange Museum in Oranienstein Castle documents the history of the Dutch royal house. Please note that castle visits are possible only with a guided tour and by prior telephone registration. As access arrangements may change, check the registration requirements before your visit.
Town walks, cycle routes and water
The Diez Cultural Trail is a signposted, self-guided town walk that takes about two and a half hours. This approximate duration provides a guide for planning your day. The Halfterweg starts at the Old Lahn Bridge and is another named walking route.
The Lahn Valley Cycle Route passes through Sachsenhausen on the opposite bank of the Lahn and continues downstream along the river. The Diez tourism area offers hiking and cycling opportunities along the Lahn and through the hilly landscapes of the Westerwald and Taunus. The stretch of the Lahn between Diez and Balduinstein is considered particularly scenic and unusually secluded.
The Lahn riverside grounds have a canoe rest stop and a motorboat landing stage, as well as a boat landing downstream for the Wappen von Limburg. Access to the water and operating schedules may vary seasonally, so check current conditions before making plans. Wassersport Danner is located where the Aar and Lahn meet and offers canoe trips of 6 to 28 kilometres. As availability and tour options may change, it is advisable to check before travelling.
Diez in the Rhein-Lahn travel destination
For regional context: the wider Rhein-Lahn travel destination includes the Rhein-Lahn district, covering the area on the right bank of the Rhine at the mouth of the Lahn, the Lahn Valley up to just before Limburg at Diez, the southern foothills of the Westerwald towards the Lahn Valley, and the northern uplands of the Taunus between the Rhine and the Aar. The Roman Limes also runs through the district; its visible remains are part of the Upper German-Raetian Limes UNESCO World Heritage Site. These wider regional connections complement Diez’s themes without equating them with the town’s own attractions.
Discover more destinations: Aull, Steinsberg, Birlenbach, Holzappel, Altendiez, Laurenburg, Dörnberg, Gückingen, Hirschberg, Heistenbach
Go to the main travel overview: Rhein-Lahn.
