To find the ancient relics in Vatican City in Indiana Jones and the Great Circle, follow these detailed step-by-step instructions for each relic:

### 1. Below the Library
**Location:** Secret passage below the Apostolic Library
**Requirements:** None
**Steps:**
1. **Explore the Secret Passage:** After inserting the Giant’s Pendant in the Library’s Conservation Workshop, proceed through the secret passage.
2. **Encounter a Locked Gate:** You will encounter a locked gate blocking your progress.
3. **Dive Underwater:** Dive underwater to swim through to the other side and unlock the gate.
4. **Find the Relic:** The first Ancient Relic will be sitting on a table next to the gate.

### 2. Lower Necropolis Relic #1
**Location:** Lower Necropolis
**Requirements:** None
**Steps:**
1. **Drop Down a Pit:** After getting stuck on the other side of a cave-in, drop down a pit with water.
2. **Swing to a Ledge:** Lower your whip to swing to a ledge instead of falling straight down.
3. **Find the Relic:** The relic is in this area, likely near the water or on a nearby surface.

### 3. Lower Necropolis Relic #2
**Location:** Lower Necropolis
**Requirements:** Lit Torch
**Steps:**
1. **Swim Through a Crack:** After the swimming section post Tomb of the Warrior Giant, swim through a crack in the wall with water dripping down.
2. **Burn Boards:** Burn some boards to reach the relic.
3. **Get a Lit Torch:** Throw a lit torch through a hole in the wall via the hallway east of the room to light it up.
4. **Find the Relic:** The relic is in this room, likely near the burned boards.

### 4. Lower Necropolis Relic #3
**Location:** Lower Necropolis
**Requirements:** Ancient Bust
**Steps:**
1. **Find the Bust:** In a large open room with soldiers, head to the upper level on the west side to find a room with a large bust.
2. **Place the Bust:** Place the bust on its pedestal to open one of the pressure plate gates.
3. **Unlock the Gate:** The gate leading to a small room with the relic will be unlocked.
4. **Find the Relic:** The relic is on the floor in this small room.

### 5. Lower Necropolis Relic #4
**Location:** Lower Necropolis
**Requirements:** None
**Steps:**
1. **Climb Wooden Beams:** Use your whip to climb up to two different wooden beams.
2. **Enter a Small Room:** Climb all the way to the top of the second wooden beam and enter a small room.
3. **Find the Relic:** The relic is located in the northwestern area of this small room.

### 6. Lower Necropolis Relic #5
**Location:** Lower Necropolis
**Requirements:** Ancient Bust
**Steps:**
1. **Find the Busts:** After climbing your whip twice and crawling through a small hole, you will be in a small hallway with two rooms.
2. **Place the Busts:** Take the bust in the corner, go to the first room, and place it on the pedestal. Break the wall between rooms using a weapon.
3. **Unlock Another Gate:** Use the first bust to weigh down the pedestal in the first room, opening another gate.
4. **Find the Relic:** The relic is located in this newly unlocked room.

### 7. Fountain Underground Relic #1
**Location:** Fountain Underground
**Requirements:** Ancient Bust
**Steps:**
1. **Crawl Through a Hole:** Crawl through a hole in the wall to reach a small room.
2. **Place the Bust:** Place the bust on a pressure plate to open a gate.
3. **Find the Relic:** The relic is inside this gate room.

### 8. Fountain Underground Relic #2
**Location:** Fountain Underground
**Requirements:** None
**Steps:**
1. **Follow Gina:** Gina will lead you to a new room.
2. **Find the Relic:** The relic is on a shelf in this room.

### 9. Fountain Underground Relic #3
**Location:** Fountain Underground
**Requirements:** None
**Steps:**
1. **Navigate the Challenge Room:** In the Challenge of Tribulation Room with swinging pendulum blades, hop across past the first blade.
2. **Jump into Oil Pit:** Jump into the pit of oil below to find an artifact on a broken column.

### 10. Below the Library (Apostolic Library)
**Location:** Secret passage below the Apostolic Library
**Requirements:** The Secret of Giants
**Steps:**
1. **Complete Fieldwork Sidequest:** Photograph all 10 Strange Inscription locations around The Vatican for Antonio.
2. **Place Photos:** Place all the photos on a corkboard next to his desk.
3. **Get the Relic:** Antonio will place the Ancient Relic on his desk when the quest is complete.

### Additional Relics

#### 8th Ancient Relic
**Location:** Main Chamber in the Underground
**Requirements:** None
**Steps:**
1. **Navigate Dragon Statues:** Find two dragon statues, each leading to a trial activated by pulling levers on the deck upstairs.
2. **Unlock a Gate:** Look for a crawlspace on the left and head through it. Grab an Ancient Bust inside and place it on a pedestal to open a gate.
3. **Find the Relic:** The relic is inside this newly unlocked room.

#### 9th Ancient Relic
**Location:** Secret Monastery, Scriptorium
**Requirements:** Gina’s lockpicking skills
**Steps:**
1. **Complete Trials:** Complete both trials in the Chamber of Tribulations.
2. **Find Hidden Passage:** Investigate books in the Scriptorium to uncover a hidden passage behind a large painting.
3. **Enter Treasury:** Lead to the Treasury of Esoteric Artifacts.
4. **Open Locked Door:** Use Gina’s lockpicking skills to open a locked door on the left.
5. **Find the Relic:** The relic is inside this room.

#### 10th Ancient Relic
**Location:** Antonio’s Office
**Requirements:** None
**Steps:**
1. **Make Progress in Stolen Cat Mummy Mission:** Make progress in the Stolen Cat Mummy mission.
2. **Find the Relic:** The final relic is on Antonio’s table in his office.

By following these detailed instructions, you should be able to find all 10 ancient relics in Vatican City in Indiana Jones and the Great Circle.