Answer:
I reach for the sky, but clutch to the ground. Sometimes I leave, but I am always around. What am I?
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
You may enter, but you may not come in. I have space, but no room, I have keys, but open no lock. What am I?
Which vehicle is spelled the same forwards and backwards?
I begin and have no end and I end all that begins. What am I?
The answer I give is yes, but what I mean is no. What was the question?