More than 500 wildfires have broken out in recent weeks across Greece, which has seen some of its highest temperatures in decades.
Here's a look at current entry rules in some popular European tourist destinations.
Travellers to Greece should submit a certificate of vaccination against COVID-19, a certificate on recovery from the novel coronavirus or a recent negative test.
Greece is aiming to kick off its vital summer season by mid-May.
Meteora is a UNESCO World Heritage Site, located near the Pinios river and the Pindos Mountains in Thessaly.
The discovery of the seal ring supports the growing evidence that Pattanam, situated between Kodungallur and Paravur, was a thriving base for international seafaring merchants in the past.
Manchester United captain Harry Maguire told the BBC that he feared for his life and thought he was being kidnapped as he was arrested by plainclothes police officers following a fracas on the Greek island of Mykonos.
The 27-year-old was handed a suspended prison sentence of 21 months and 10 days by the Greek court.
British media reported he had been found guilty of repeated bodily harm, attempted bribery, violence against public employees and insult after his arrest on Greek island Mykonos.
Maguire appeared in court on Saturday following two days in detention over a brawl on the island of Mykonos. England international Maguire, 27, will respond to the charges against him on Tuesday, according to local police.