The best-preserved Roman oven, north of the Alps, is at Augusta Raurica which is a Roman archaeological site and an open-air museum in Switzerland; located on the south bank of the Rhine river, about 20 km east of Basel near the villages of Augst and Kaiseraugst, it is a art of the oldest known Roman colony on the Rhine.
if you can get a chance to hike up devil’s mountain (teufelsberg) on a sunny summer day you just might be in heaven. you will most likely have to break in or crawl under a fence, which is just the beginning of the excitement. the place is totally destroyed but if you bring a flashlight you can go through and see all the broken down madness of the old spy station. climb to the observation deck and have a picnic where you can see a panoramic view of all of berlin