Before the trip it is necessary to do some research.
The Robert Koch Institute and the Foreign Office do not prohibit travel, but they do not make it easy for you either.
Detailed lists of the states and regions for which a travel warning applies are published.
Conversely, you have to find out which countries still allow visitors into the country and whether there is a quarantine obligation when you return to Germany.
We have made the effort for you and here is an overview.
Iceland
Iceland is currently Europe's only complete country for which the Federal Foreign Office has not issued a travel warning.