Upvote:0
For Cologne, I found this page listing prices for 1-day passes. According to the Tarifberater (German only) the 1b price zone (€8.60) should get you the whole of Cologne -- I wasn't able to discover what the 1a zone would correspond to. This page (German only) gives more information on the conditions of the ticket. In short, it lets you use all local transport and regional trains until 03:00 on the day after purchase.
Upvote:1
Cologne:
1 day: 7,10 € - 29,40 €.
Tourists usually use Ticket 1b (8,60 €) for "Köln (2100)".
Munich:
1 day: 6,70 € - 13,00 €. 3 days: 16,80 € (Innenraum/inner region only).
Tourist are usually fine with "Innenraum" (6,70 €). For the KZ in Dachau, you need "Munich XXL" (8,90 €). "CityTourCard" (1/2/3/4/5/6 days) and "MünchenCard" (1/2/3/4/5 days) offer discounts for tourist attractions.
Berlin:
1 day: 3,60 € - 21,00 €. 7 days: 13,10 € - 67,30 €.
Day passes for Berlin city are 7,00 € - 7, 70 €.
There are also offers for tourists: "WelcomeCard" (2/3/4/5/6 days), "CityTourCard" (2/3/4/5 days), "EasyCityPass" (2/3/4/5/6 days), "QueerCityPass".