Abbaye de Saint Germain des Pres

One of the oldest churches in the city, this cathedral's interior is highlighted by a series of colorful frescoes inside. The church was part of a medieval monastery complex, and although the other surrounding buildings have disappeared since then it is still standing, and it is fascinating to see what the churches actually looked like to medieval pilgrims. It is an important archaeological and tourist place for Paris, we advise you to visit it.