How do I save GameObject data with JsonUtility?

What I’m wanting is to be able to save a GameObject and save some specific data from it, to allow for a saving and loading of the game world.
Here is my SaveToJSON.cs

using UnityEngine;
using System.Collections.Generic;
using System.IO;

public class SaveToJSON : MonoBehaviour {
    public string worldName;
    public List<GameObject> pedestals;
    public List<Pedestals> pedestalData;

    public string worldSaveData;
    public WorldData worldData;

    void Start () {
        foreach (GameObject pedestal in pedestals) {
            pedestalData.Add(pedestal.GetComponent<Pedestals>());
        }
    }

    void Update () {
        if (Input.GetKeyDown(KeyCode.O)) {
            worldData = new WorldData(worldName, pedestals, pedestalData);

            worldSaveData = JsonUtility.ToJson(worldData);

            File.WriteAllText(Application.dataPath + "/Saves/worldData.json", worldSaveData.ToString());
        }
    }
}

public class WorldData {
    public string worldName;
    public List<GameObject> pedestals;
    public List<Pedestals> pedestalData;

    public WorldData (string worldName, List<GameObject> pedestals, List<Pedestals> pedestalData) {
        this.worldName = worldName;
        this.pedestals = pedestals;
        this.pedestalData = pedestalData;
     }
}

My Pedestals.cs

using UnityEngine;

public class Pedestals :  MonoBehavior {

    public bool hasTower = false;
    public float altitude;
    [Range(0f, 3f)]
    public float y;

    private RaycastHit _hit;
    private Renderer _renderer;

    void Awake () {
        _renderer = transform.GetComponent<Renderer>();

        altitude = transform.position.y + (_renderer.bounds.size.y / 2);
    }
}

I’ve tried brain-storming and done some searching around, but I can’t seem to find my answer. With those two classes all I get is this in my worldData.json file.

{"worldName":"Level 1","pedestals":[{"instanceID":11936},{"instanceID":11800},{"instanceID":11942},{"instanceID":12714},{"instanceID":11992},{"instanceID":10990},{"instanceID":12800},{"instanceID":11298},{"instanceID":12454},{"instanceID":10866},{"instanceID":12394},{"instanceID":11362},{"instanceID":12266},{"instanceID":10984},{"instanceID":11278},{"instanceID":12142},{"instanceID":11486},{"instanceID":10896},{"instanceID":11028},{"instanceID":12076},{"instanceID":12708},{"instanceID":12230},{"instanceID":11336},{"instanceID":10774},{"instanceID":11386},{"instanceID":11046},{"instanceID":11766},{"instanceID":12312},{"instanceID":11900},{"instanceID":11830},{"instanceID":11310},{"instanceID":11956},{"instanceID":11316},{"instanceID":12224},{"instanceID":11916},{"instanceID":12562},{"instanceID":10784},{"instanceID":12776},{"instanceID":11526},{"instanceID":12172},{"instanceID":12512},{"instanceID":10792},{"instanceID":11572},{"instanceID":10836},{"instanceID":11788},{"instanceID":12530},{"instanceID":12378},{"instanceID":11892},{"instanceID":12218},{"instanceID":10758},{"instanceID":10848},{"instanceID":11164},{"instanceID":11492},{"instanceID":11680},{"instanceID":12416},{"instanceID":11922},{"instanceID":10684},{"instanceID":10644},{"instanceID":11586},{"instanceID":12640},{"instanceID":12350},{"instanceID":11536},{"instanceID":12254},{"instanceID":11748},{"instanceID":10650},{"instanceID":12136},{"instanceID":12040},{"instanceID":12034},{"instanceID":12186},{"instanceID":11180},{"instanceID":10888},{"instanceID":11174},{"instanceID":10968},{"instanceID":12582},{"instanceID":12700},{"instanceID":11346},{"instanceID":10956},{"instanceID":12646},{"instanceID":11672},{"instanceID":12664},{"instanceID":11236},{"instanceID":12296},{"instanceID":10616},{"instanceID":11512},{"instanceID":10880},{"instanceID":11708},{"instanceID":11724},{"instanceID":11356},{"instanceID":11290},{"instanceID":11854}],"pedestalData":[{"instanceID":11938},{"instanceID":11802},{"instanceID":11944},{"instanceID":12716},{"instanceID":11994},{"instanceID":10992},{"instanceID":12802},{"instanceID":11300},{"instanceID":12456},{"instanceID":10868},{"instanceID":12396},{"instanceID":11364},{"instanceID":12268},{"instanceID":10986},{"instanceID":11280},{"instanceID":12144},{"instanceID":11488},{"instanceID":10898},{"instanceID":11030},{"instanceID":12078},{"instanceID":12710},{"instanceID":12232},{"instanceID":11338},{"instanceID":10776},{"instanceID":11388},{"instanceID":11048},{"instanceID":11768},{"instanceID":12314},{"instanceID":11902},{"instanceID":11832},{"instanceID":11312},{"instanceID":11958},{"instanceID":11318},{"instanceID":12226},{"instanceID":11918},{"instanceID":12564},{"instanceID":10786},{"instanceID":12778},{"instanceID":11528},{"instanceID":12174},{"instanceID":12514},{"instanceID":10794},{"instanceID":11574},{"instanceID":10838},{"instanceID":11790},{"instanceID":12532},{"instanceID":12380},{"instanceID":11894},{"instanceID":12220},{"instanceID":10760},{"instanceID":10850},{"instanceID":11166},{"instanceID":11494},{"instanceID":11682},{"instanceID":12418},{"instanceID":11924},{"instanceID":10686},{"instanceID":10646},{"instanceID":11588},{"instanceID":12642},{"instanceID":12352},{"instanceID":11538},{"instanceID":12256},{"instanceID":11750},{"instanceID":10652},{"instanceID":12138},{"instanceID":12042},{"instanceID":12036},{"instanceID":12188},{"instanceID":11182},{"instanceID":10890},{"instanceID":11176},{"instanceID":10970},{"instanceID":12584},{"instanceID":12702},{"instanceID":11348},{"instanceID":10958},{"instanceID":12648},{"instanceID":11674},{"instanceID":12666},{"instanceID":11238},{"instanceID":12298},{"instanceID":10618},{"instanceID":11514},{"instanceID":10882},{"instanceID":11710},{"instanceID":11726},{"instanceID":11358},{"instanceID":11292},{"instanceID":11856}]}

Any and all help is appreciated immensely.

These are just reference tyes. You should save your data explicitly. For instance your Pedestals script must be containing some fields and you have to write all them to json file as key-value pairs like you did for worldSaveData.
You could do this in a loop for each List of yours.

foreach(Pedestals p in pedestalData){
        string pedestalDataJson = string.Empty;
        pedestalDataJson = JsonUtility.ToJson(p);
  }  

In above code put your each pedestalDataJson value into another key so your total json would seem
something like → {wordData:{pedestals:[pedestal1:[{attribute1}, {attribute2}, {so on…}}]]}}

Hope this pattern helps you.