The archaeologists believe the camp dates to about 6 AD, which, if confirmed, could make it the winter camp of Emperor Tiberius.
Carnuntum eventually became a city of 50-thousand people and a major military and trade outpost linking the far-flung Roman empire’s Asian boundaries to its central and northern European lands.
It was one of the few Roman sites in Europe that was not built over during the Middle Ages, and has now become an archaeological park, which attracts some 160,000 visitors every year.
http://www.telegraph.co.uk/earth/environment/archaeology/10912474/Remains-of-Roman-army-base-found-in-Austria.html
Dang. Can you imagine standing there? I'm getting chills thinking about it.