Good Riddles

Question: A man walks all the way around the world without getting wet.

How does he do this?

Question: I only point in one direction,
but I guide people around the world.

What am I?

Question: A trail, a union, together tied.
Come across me and you will find,
you cannot change the course I'm on,
without me you cannot travel on.

What am I?

Question: What do you use to hoe a row, slay a foe, and wring with woe?

Question: What room can no one enter?