There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

Why is 6 afraid of 7?

I travel all around the world but always stay in the corner. What am I?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Can you solve the below geography rebus by decoding the below rebus ?

You can hear me, but you can't touch or see me.

What am I?