What has one letter and starts with an E?

Only Highly Attentive Can Spot The Ladder In This Library In 7 Seconds! Can You?

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?

Can you name some countries which do not have the alphabet 'A' in them?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

Can you find the thief by just looking at the picture below?

When 99 is considered higher than 100?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211