AN ANSWER TO YOUR
Why was the Teocalli built high on the hill rather than at the
bottom where we could see the interior of the sanctuary more easily?
The short answer is because we feel that is where God wanted it. Yes, it's not where we would have put it in the normal course. But we feel He gave us some clear indications in prayer that this was the location He wanted, for reasons which should become clearer in the future.
And it only seems fitting that God's Altar should be placed on high, so that by physically raising our eyes to the Lord, our hearts might follow. As the Psalms say:
I lift up my eyes to the hills.
From where does my help come?
My help comes from the Lord,
Who made Heaven and earth (Ps. 120)
To You I lift up my eyes,
Oh You who are enthroned in the heavens! (Ps 123)
In the Gospel read on Divine Mercy Sunday
Jesus famously says to Thomas,
"... Blessed are those who have not seen and yet believed.”
In this instance when our physical sight experiences limitations, our spiritual sight can become more acute.
By your faith, your presence and your participation in the Mass, even if you can't see everything, you will receive the grace and promise of the Mass and of Divine Mercy Sunday.