He wants to travel to the edge of the earth.
edge of the earth
idiomA very remote place.
They moved to a small village at the edge of the earth to escape the noise of the city.
The explorer spent years searching for the lost temple, eventually venturing to the very edge of the earth to find it.
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bleeding edge
Something too new and untested to be reliable or to have any assurance of safety; the figurative place where such things exist.
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come down to earth
To be brought back to reality; to emerge from a daydream.
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cost the earth
To be a huge expense.
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cutting edge
The forefront, or position of greatest advancement in some field.
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edge of the world
A very remote place.
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edge out
To defeat in a contest or a game by a narrow margin of victory.
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go to the ends of the earth
To do everything possible to achieve something.
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God's green earth
The world.