Room Riddles

Google Riddle - The Coin Tower
Riddle:
If you pile up coins one on top of another until they get as high as the Empire State Building - would you be able to fit them all into one average sized room? (The 'Google Riddles' are interview questions those who wish to get hired were asked).
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You May Enter...
Riddle:
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?
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The Dark Room
Riddle:
You enter a dark room. In the room there is a gas stove, a kerosene lamp and a candle. You have a matchbox in your pocket, what will you light first?
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