Answer:
The more you look at it, The less you see.
Before Mount Everest was discovered, what was the highest mountain on Earth?
What has keys but no locks, Space but no room, You can enter but you canβt exit.
Take one royal word in the plural and make it singular by adding one letter
What freezes after it is heated up?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.