Good Riddles

Question: What has rivers but no water, forest but no trees and cities but no people.

Question: You're in a VERY dark room. You enter it, and immediately everything you see dissolves into darkness... But suddenly, you see the faintest red light. You COMPLETELY close and cover an eye, but You can still see the red light. How is this possible?

Question: What exponents other than the same two numbers with the numbers one thru ten can be flipped and have the same answer?

Question: What is tall and have 4 legs

Question: If 1+1=2, 2+2=8, 3+3=18. What does 4+4=?