5 Sights in Blaubeuren, Germany (with Map and Images)

The Blauhöhle is the largest known cave system in the Swabian Alps in southern Germany. The Blauhöhle presumably originated in a time when the Danube still flowed through the Blau valley. Since the shifting of the Danube, several small rivers, the Schmiech, the Ach, and the Blau, have flowed through this valley. The cave system begins about 21 meters under water at the base of the Blautopf. It continues west and northwest, rising and falling several times until after a horizontal distance of about 1,200 metres (3,900 ft) it comes above the level of ground water and opens into the second big air-filled chamber. The maximum depth of the cave under water is 42 metres (138 ft).

Wikipedia: Blauhöhle (EN)

The Brillenhöhle is a cave ruin, located 16 km (9.94 mi) west of Ulm on the Swabian Alb in south-western Germany, where archaeological excavations have documented human habitation since as early as 30,000 years ago. Excavated by Gustav Riek from 1955 to 1963, the cave's Upper Paleolithic layers contain a sequence of Aurignacian, Gravettian and Magdalenian artifacts. In 1956 the first human fossils were discovered within a fireplace in the center of the cave, a discovery which made important contributions to the foundational understanding of the Magdalenian culture of central Europe.

Wikipedia: Brillenhöhle (EN)

The ruins of Gleißenburg are the ruins of a hilltop castle on a 640 m high rocky outcrop above the Höllental valley west of Beiningen, a district of Blaubeuren in the Alb-Donau district in Baden-Württemberg.

Wikipedia: Ruine Gleißenburg (DE)

The Roman Catholic parish church of the Visitation of the Virgin Mary is located in Blaubeuren, a town in the Alb-Donau district of Baden-Württemberg. The parish belongs to the deanery of Ehingen-Ulm of the diocese of Rottenburg-Stuttgart. It is registered as an architectural monument with the Baden-Württemberg State Office for the Preservation of Monuments.

Wikipedia: Mariä Heimsuchung (Blaubeuren) (DE)

The Protestant parish church of St. Peter and Paul is located in Blaubeuren, a town in the Alb-Donau district of Baden-Württemberg. The parish belongs to the church district of Blaubeuren of the Evangelical Church in Württemberg. It is registered as an architectural monument with the Baden-Württemberg State Office for the Preservation of Monuments.

Wikipedia: St. Peter und Paul (Blaubeuren) (DE)