Answer:
Iron on a mammal. Mammal on your feet.
I am the red tongue of the earth, that buries cities.
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
A building where people and stories are on stage
Come up and let us go. Go down and here we stay.
I have two eyes in the front and a lot of eyes on my tail
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?