Shadow of the Colossus: all secrets, hidden modes and easter eggs

There's quite a lot hidden around the world of Shadow of the Colossus.

Shadow of the Colossus secrets - top secret secrets (PS2 / PS3) Playstation 2 / Playstation 3

I just finished SOTC, and i have so many questions, so how did these guys know Wander was here and how do they know him? What is Dormin and why was he

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The Decade-Long Quest For Shadow of the Colossus' Last Secret

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Is this a Shadow of the Colossus Easter egg? — Unknown Worlds Forums

Shadow of the Colossus (PS4): How To Find The Secret Garden & Poison Fruit - Gameranx

Shadow of the Colossus Easter Eggs (PS4) - Shadow of the Colossus and ICO Guide - IGN

Shadow of the Colossus - Secrets, Unlockables and Easter Eggs ~ Games On Review

Secret Sword Discovered in 'Shadow of the Colossus' Remake

Nomad's blog: Maps, Symbols, Icons & Secrets!

Shadow of the Colossus (PS4): How To Find The Secret Last Guardian Easter Egg Cave - Gameranx