Best difficult riddles for teens with simple answers

I live in a hotel, on the land or in the sea, whatever could I be?

What goes on increasing every second but never decreases?

I am covered in feathers or foam, yet I have no wings and cannot fly. I am the only place where you can lose and find your mind at the same time.

I have a headboard but no brain, and a footboard but no toes. You visit me to travel to worlds that don't exist. What am I?

I am the place where the earth meets the sky and the water kisses the land. I disappear twice a day, only to return again. What am I?

What is the ancient invention that allows people to see through walls?

What is more impressive than a talking dog?

What is a fish without an eye?

What goes up and down the stairs without moving?

What clothes does a house wear?