Frankfurt is one of Germany’s most visited cities after Berlin and Munich. The ease with which you can visit it also on foot will make your holiday extremely relaxing, but never boring.
An identity card valid for leaving the country allows entry into European Union countries. However, please note that there have been reports of difficulties in some countries with the recognition of renewed and stamped paper identity cards, as well as the refusal of electronic ID cards renewed with a certificate issued by the municipality.
An ordinary passport is valid for all countries whose governments are recognized by the Italian one, except for any legal restrictions, and can be obtained by all citizens of the Republic. A passport is issued (and renewed) by the police and abroad, by diplomatic and consular representatives. It is valid for 10 years, but in some cases provided for by current legislation, this validity may be shortened.
For more information, see www.poliziadistato.it