Here, we look at the top 10 holiday destinations for Britons and what the British Foreign Office advises visitors.
The top destination for British holidaymakers in 2015 was Spain, followed by France and Italy, according to the Office of National Statistics.
The British Foreign Office say that there is a "general" threat from terrorism in Spain at the moment, due to a global threat of terrorism against UK interests and British nationals.
It says: "The Basque terrorist organisation ETA has been less active in recent years and has not mounted any attacks since 2009.
"In October 2011 ETA announced a 'definitive cessation of armed activity'. ETA's last major attack was in 2006. British Nationals have not been a target of ETA terrorism."
The British Foreign Office says there is a "high" threat from terrorism in France.
"Due to ongoing threats to France by Islamist terrorist groups, and recent French military intervention against Daesh (formerly referred to as ISIL), the French government has warned the public to be especially vigilant and has reinforced its security measures," it says.
France is under a national state of emergency, which has been extended until 15 July 2017.
There is a "general" threat from terrorism in Italy, according to Foreign Office travel advice.
The advice also mentions strong earthquakes in January in the regions of Lazio, Abruzzo and Marche. There was also an earthquake last year which killed 300 people.
Tourists are advised to look at the Italian Civil Protection website to find out what they should do before, during, and after an earthquake.
There is an "underlying" threat from terrorism in Ireland at the moment, according to the Foreign Office.
Travel advice also suggests visitors take a form of photo identification with them, as well as double-checking new drink driving limits.
There is a "general" threat of terrorism in the United States.
British visitors need prior authorisation to enter the United States, either through a visa, a permanent residency card, or a visa waiver program.
President Trump's travel ban - even though it has been overturned - may mean exact visa and entry requirements could change at short notice.
The Foreign Office also warns of extreme weather which can potentially cause delays, and say there is a risk of Zika virus transmission in Florida, Texas (Cameron County only), Puerto Rico and the US Virgin Islands.
There is an "underlying" threat of terrorism in Portugal.
Travel advice also warns visitors to be careful of street crime.
There is a "high" threat from terrorism in Germany, according to British Foreign Office travel advice.
The advice says: "The German government has announced that increased security has been put in place as a precaution at public buildings, major events, transport hubs and large public gatherings."
There is a "general" threat from terrorism in the Netherlands, according to the British Foreign Office, but it notes "most visits are trouble-free".
It also warns that several people have died after buying "a substance which is sold as cocaine, but is actually white heroin".
There is a "general" threat from terrorism and "acts of political violence".
It also notes that there are frequently strikes, which can cause travel disruption, and that political demonstrations take place at short notice.
There is a "low" threat from terrorism in Poland.
Foreign Office travel advice adds that "driving in Poland can be hazardous".
- For detailed advice on travel to countries around the world, visit the Foreign Office website