Greifenstein castle was first mentioned in 1158. The castle was largely destroyed in the second half of the 13th century during the wars between Count Meinhard II of Tyrol-Gorizia and the Bishop of Trent. The reconstructed castle became property of the lords of Starkenberg after the last member of the family of Greifenstein was killed in the Battle of Sempach in 1386.
Greifenstein was besieged for weeks by Duke Frederick IV of Austria-Tyrol first in 1418 and again in 1423. During the second time castle was conquered in 1426. After the Habsburg family took the possession. Today Greifenstein lies in ruins.
The Amphitheatre of the Three Gauls was part of the federal sanctuary of the three Gauls dedicated to the cult of Rome and Augustus celebrated by the 60 Gallic tribes when they gathered at Lugdunum (Lyon). The amphitheatre was built at the foot of the La Croix-Rousse hill at what was then the confluence of the Rhône and Saône.
Excavations have revealed a basement of three elliptical walls linked by cross-walls and a channel surrounding the oval central arena. The arena was slightly sloped, with the building"s south part supported by a now-vanished vault. The arena"s dimensions are 67,6m by 42m. This phase of the amphitheatre housed games which accompanied the imperial cult, with its low capacity (1,800 seats) being enough for delegations from the 60 Gallic tribes.
The amphitheatre was expanded at the start of the 2nd century. Two galleries were added around the old amphitheatre, raising its width from 25 metres to 105 metres and its capacity to about 20,000 seats. In so doing it made it a building open to the whole population of Lugdunum and its environs.