On our first day in Frankfurt we visited Frankfurt's well known catherdrals the 'Dom' in German, the building is very old dating back to the fourteenth century and kept in a very good condition. It was once used to crown the emporors of the holy roman empire, it had stunning stone structures and glasswork the whole place was decorated for royalty. The catherdral is a must see can't turn down something thats free.
The next day we where recommended by the hotel we were staying at to spend the day at the Palmengarten which is Frankfurt's Botanical Garden just like other gardens it had a very wide array of plants, flowers and birds to see. It turned out to be a very nice day and we had a very relaxing time walking around the garden.