Simplify the following text for a Grade 9 native English-speaking person.
Original: The largest stone scree in Northern Europe , with huge boulders lying helter skelter on the floor of the valley , is here `` UrdbÃ uri '' , is the name of this famous sight ( site ) .
Simplified: Its famous attraction is the `` UrdbÃ uri '' , the largest stone scree in Northern Europe , with huge boulders scattered on the floor of the valley .