Answer:
What is the word that even in plain sight remains hidden?
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
I am an instrument you can hear but cannot touch or see. What am I?
I go in dry and come out wet. The longer I stay in, the stronger my surroundings get. What am I?
I am full of holes but still holds water.
What age most travelers have?