Nassau is a picturesque city located in the Rhineland-Palatinate province of Germany. Nestled along the Lahn River, Nassau is known for its rich history dating back to the 12th century when it was founded by the Counts of Laurenburg. The city boasts charming medieval architecture, including the historic Nassau Castle overlooking the town. Visitors can explore attractions such as the Romanesque St. Katherinen Church and the Nassau Museum, which offers insights into the city's past. Its strategic location on the river made Nassau a prominent trading hub in the Middle Ages, contributing to its significance in the region.