Garden of Hesperides
The Olympian Herb can be found near Khalkos Coppersmith opposite to the Mount Olympus dungeon.
Banner of Apollo
The Banner of Apollo can be found in the Sun Room where you defeat Apollo Bright One. It is located near the entrance to the room.
Grand Statue of Zeus
The Grand Statue of Zeus can be found directly in front of the Sky Balcony, when you defeat the guards on your way to Ares. It is so big and massive that you can't miss it.
Atlantea Grand Monument
The Atlantea Grand Monument can be found right when you walk in to Atlantea, near Hermes.
The Atlantean Arch can be found to the left in Akheilo's Sanctum.
Nine Fathoms Pedestal
The Nine Fathoms Pedestal can be found to the far back right in Teles' Sanctum.
The Underworld Brazier can be found near the broken statue by the River of Spirits. Be careful of the Bronze Hoplites as they can easily pull you into battle.
Ember Stone of Tartarus
The Ember Stone of Tartarus can also be found near the River of Spirits.
Hades the Unseen Mural
The Hades the Unseen Mural can be found in the place where you battle Hades, I decided to use a picture over the map because it's a lot more accurate.
I hope you enjoyed this guide! Good luck on getting these items.