All Around My Town. Logic Riddles.

What always comes into a house through the keyhole?

What building has the most stories?

What starts with a ‘P’, ends with an ‘E’ and has thousands of letters?

When is a yellow dog most likely to enter a house?

The red house is on the white street, and the blue house is on the red street. Where is the white house?

I'm in you,

But not in him,

I go up,

But not down,

I'm in the colosseum,

But not a tower,

I'm in a puzzle,

But not a riddle.

How do you get to Carnegie Hall?

I go around all the places; cities, towns and villages, but never come inside. What am I?

How does a dog cross a river without getting wet?

A man lives on the top floor of a hotel. When he is out with a friend or out on a rainy day, he comes back, goes to the elevator, and goes to the top floor. When he goes out alone or on a sunny day, he goes half way up and walks the rest of the way up. Why?