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Since 9/11, major terrorist attacks have continued to occur in North America, Europe, and beyond. Anxiety levels are still high, not only because of local citizens, but also due to the amount of tourists that visit these regions.

From religious extremists to far-right radicals, click through and get to know the timeline of attacks in these touristic cities since 9/11.

▲Two commercial airplanes are hijacked, and crashed into the World Trade Center complex in New York City, and a third plane crashes into the Pentagon. 2,996 people die and over 6,000 are left injured.

▲Bombs are detonated in four Madrid commuter trains during the morning rush hour, killing over 191 people and injuring around 2,000.

▲Suicide-bombers blow themselves up in London. The targets are three underground trains and a bus. The attack kills 52 people and injures over 700.

▲Two U.S. airmen are shot dead and two people are injured in an attack at Frankfurt Airport.

▲Far-right terrorist Anders Behring Breivik plants a car bomb in Oslo followed by a mass shooting at a youth camp on Norway's Utoya island. The attack kills 77 people, mostly teenagers.

▲Mohammed Merah carries out attacks in Toulouse and Montauban, France. He kills three Jewish schoolchildren, a rabbi, and three French Army soldiers.

▲Two homemade bombs are detonated close to the finish line of the Boston Marathon, killing three people and injuring about 264.

▲British Army soldier Lee Rigby is attacked and killed in a London street.

▲Four people are killed in a terrorist attack at the Jewish Museum in Brussels.

▲Terrorists attack Charlie Hebdo's offices in Paris, and conduct four other attacks around the city. In total, 17 people are killed.

▲A number of terrorist attacks, including suicide-bombings and mass shootings, kill 130 people and injure hundreds more in Paris, France.

▲A couple conducts a mass shooting and kills 14 people in San Bernardino, California. Around 22 people are seriously injured.

▲Two suicide-bombings take place in Belgium. One at Brussels Airport and the other in the city's subway. A total of 32 people die in the attacks.

▲A mass shooting kills 50 people at a gay nightclub in Orlando, Florida.

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A truck drives through a crowd on Bastille Day in Nice, France. In total, 86 people die in the attack and 304 spectators are taken to hospital with injuries.

▲Two men take five people hostage during a Mass at a church in Normandy, France. They kill the priest.

▲An Ohio State University student drives his car into a group of students and stabs people with a butcher knife.

▲A terrorist drives a truck through a Christmas market in Berlin, Germany, killing 12 people.

▲A man drives his car into pedestrians outside the Palace of Westminster in London. Four people are killed and more than 40 injured.

▲A man drives into a pedestrian shopping street and department store in Stockholm, Sweden. The attack kills five people and injures over a dozen.

▲A suicide-bomber detonates a device in the foyer area of the Manchester Arena during an Ariana Grande concert. Ultimately 22 people were killed and dozens more are left injured.

▲Terrorists plow through pedestrians on London Bridge and stab people in Borough Market. The London attack kills eight people and injures almost 50.

▲A number of attacks take place in Barcelona and Cambrils (Tarragona), Spain, including a van being driven into pedestrians, killing 14 people.

▲A bucket bomb explodes on the London tube. 30 people are injured but there are no fatalities.

▲A man shoots and kills 11 people in Pittsburgh's synagogue in the US.

▲A man drives a truck into a crowd of pedestrians and cyclists on a bike path in New York City. A total of eight people die in the attack.

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A terrorist attack kills at least 49 people in two mosques in Christchurch, New Zealand.

In the years that have followed, more major attacks have been carried out–far too many to list.

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A lone gunman shoots four people dead and wounds others 23 in a busy nightlife area in Vienna, Austria.

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Two suspected suicide bombers attacked the Sacred Heart Cathedral in Makassar, Indonesia, injuring at least 20 people.

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A bomb left inside a bag exploded on İstiklal Avenue in Istanbul, Turkey, killing 6 people and injuring 81 others.

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An Islamist bombing occurred during a Catholic Mass at the gymnasium of Mindanao State University in Marawi, Philippines, killing four people and injuring at least 50 others.

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A knife attack took place at an Assyrian Orthodox Church in Wakeley, a suburb of Sydney, Australia. A 16-year-old male attacker stabbed a bishop, a priest, and churchgoers. The incident was sadly captured on a livestream that was being conducted by the church.