The fortifications in Bassano del Grappa was mentioned already in 998. Bishop of Vicenza donated the town in the late 12th century to Ecelo I, founder of later powerful family of Ezzelini. The oldest structures of castle still present date from the 12th and 13th centuries.
In 1411 during the war between the Republic of Venice and the Kingdom of Hungary its fortifications resisted the attacks of Emperor Sigismund of Luxembourg. The castle was later conquered by Maximilian I of Habsburg during the War of the League of Cambrai in 1508. After it was decommissioned and the left to decay.
Today the castle, after restoration, is used to display temporary exhibitions and theater performances.
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.