"Final Fantasy XV" is full of with side quests all throughout the land of Eos. These side quests are in various locations in the wilderness as well as in towns, and outposts. One of these towns is Altissia and here are the side quests you can find there.
Symbol of Peace Side Quest in Altissia, "FFXV"
The Symbol of Peace side quest is in Xona Resbenxiale Dolsare. Upon entering Altissia, you will hear that Luna's dress is on display but no one tells you where it is located. In order for you to discover the location, climb up near the stairs where you first heard about it. After that, go to the location, which is indicated on the map. Completing this quest will give you 1,000 EXP.
Photo Op: Bar Side Quest in Altissia, "FFXV"
All the side quests in Altissia are in Xona Resbenxiale Dolsare. Photo Op: Bar is also one of the numerous photo op side quests in "Final Fantasy XV." For this specific photo op, go in the direction of the Maagho bar in Altissia. In completing this side quest, bear in mind, though, that you can only have a photo op here throughout the daylight. Completing this side quest will let give you 400 EXP, according to IGN.
Photo Op: Park Side Quest in Altissia, "FFXV"
This side quest can be completed in Altissia when you have already reached Level 9. To accomplish this, just go to the park where you can see a huge narwhal statue. The place is located north of where you first set foot in Altissia. This side quest will reward you 400 EXP when accomplished.
Photo Op: Palace Side Quest in Altissia, "FFXV"
The Palace photo op is in Altissia. Like Park side quest, you are required to reach at least Level 9 to play this. You can complete this by hiking along the teal gondola route. In there, according to GameFaq, Prompto will ask you if he can take a picture and you can start taking it at the start of the route. This side quest will reward you 400 EXP.