Roman Apollo-Grannus-Temple Phoebiana (PANIONEI)

At its peak, the size of the complex is estimated at approximately 40 ha. The temple itself is about 1000 m² large. The roads leading to Phoebiana converged on the complex's forum.

At today's entrance in the south of the complex stands a medieval well. From here, the steps of a staircase lead to the inner colonnade, porticus II. In the extension, one can see the ramp leading from the temple courtyard, temenos, to the temple antechamber, the proanos. This is followed by the main room, the cella. Eight of the originally 14 columns of the porticus enclosing the temple courtyard on three sides are preserved or reconstructed. The western columns still show part of the wall to the outer porticus I and are covered. Behind the temple is a shop, taberna. Here are the remains of another medieval well (2). Of the columns of the outer porticus, only a single one in the western part is preserved. The former course of the colonnade is painted in white on the path.

The first excavations began in 1888 by the Faimingen village teacher Magnus Scheller. In this and several subsequent excavations, the temple and remains of the adjacent buildings could be uncovered. The partially visible reconstruction today was made possible by the discovery of 150 hewn stones in 1972 in the Brenz river, as well as the same number of spolia from the fort wall. Ultimately, the discovery of two milestones under the parish church of the neighboring community Gundelfingen in 1981, on which the names Phoebiana and Apollo-Grannus are recorded, provided information about the name and purpose of the finds. Furthermore, they state that the Roman Emperor Caracalla donated roads and bridges here in 212/213. In 2002, another milestone with the inscription Phoebiana was found in Sontheim an der Brenz.

An open-air museum was established on the site of the former Apollo-Grannus Temple in 1987.