von Hutten. The Balleshaus was built in 1725 by the clothier Georg Roth and served for more than two hundred years as a residential house. The town acquired it from its last owners, the family Balles, and renovated it. Ever since, it has housed the town library and archive. In Arnstein's new residential area has stood since the late 1990s a terraced housing development with 20 low-energy houses, the so-called Arnsteiner Sonnenhäuser (“Sunhouses”). Part of the energy supply comes from a solar collector area of more than 210 m² through which water is heated and household heating is provided. Furthermore, 95% of the space heat can be recovered through a controlled ventilation system. By using rainwater to flush the toilets, choosing ecologically friendly building materials, forgoing a basement and thus insulating the houses and taking other measures, further energy-saving and environmentally protective measures could be realized. The “Sunhouses” were built collaboratively by the 20 builders in the framework of the promotional programme for experimental home building, thereby reducing acquisition and planning costs. Monuments Not far outside Arnstein, on Bundesstraße 26a going towards Schwebenried, stands the Schnittpunktdenkmal, or “Crossing Point Monument”. It marks the spot where the 50th parallel of north latitude crosses the 10th meridian of east longitude: . Economy and infrastructure Solar park In May 2005, the world's biggest solar park was built near Arnstein (Erlasee). MIWE The biggest employer in town for over 80 years has been the firm MIWE GmbH. At the main MIWE works in Arnstein today, roughly 400 workers manufacture industrial ovens, ovens for bakeries and bakery and cooling technology products. Education the following institutions existed in Arnstein: Michael-Ignaz-Schmitt-Realschule Primary school and Hauptschule Kindergartens Recreation The Naturbadesee Arnstein (lake) lies right near the town. The bathing lake was laid out in the course of the kleine Gartenschau (“Little Garden Show”) in 1997. There are various sunbathing lawns, a raft, a beach volleyball court and a kiosk with a lakeside terrace. For children there is a playground with a “living willow” village (Weidendorf) and a nature playground. The Walderlebnispfad Arnstein (“Forest Adventure Path”) lies between Arnstein and Reuchelheim somewhat above the dale and is roughly 2.5 km long. The Gewässerlehrpfad Wern/Arnstein (“Bodies of Water Learning Path”) is about 1 km long. The Wernradweg (“Wern Cycle Path”) is a 78 km-long cycle path running from the Wern's source by way of Arnstein down to the river's outflow