Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Uncertainty about when the Isle of Man's border will open to holidaymakers means its historic sites will have limited opening in 2021, the island's heritage body has said.

Isle of Man heritage sites 'will not fully reopen in 2021 without tourists'