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On 28 June 1914, Archduke Franz Ferdinand, heir to the Austro-Hungarian Empire, visited Sarajevo. What happened in the city that day would set in motion a series of events that would lead the world to war. Watch the trailer, external.
One hundred years later, BBC News revisits this critical day, as it happened.
Read more about how we have delivered this exciting innovation in the Editor's blog.
The royal visit is one of the most significant tours by the heir to the Austro-Hungarian Empire. He has been accompanied on the tour by his wife, Duchess Sophie of Hohenberg.
The archduke has spent the last two days with the military while Sophie has visited schools, orphanages and churches in Sarajevo.
Today's drive through Sarajevo is expected to be the highlight of this visit.
Image source, Mary Evans Picture LibraryThe couple have been staying at the luxurious Hotel Bosna in Ilidza, six miles (10km) west of Sarajevo, during the official visit.
They are currently on board a train to Sarajevo, expected to arrive at 09:50.
Last night the couple dined at a special banquet with 41 guests, including Bosnia's top military, religious and civil officials.
Image source, Mary Evans Picture LibraryHotel Bosna, Ilidza
The archduke is a seasoned traveller and has visited some of the furthest-flung corners of the globe, taking in Australia, New Zealand, China, Japan, Canada and the U.S. on a world tour in 1893.
He last visited Britain in November last year. The archduke and Sophie stayed with the King and Queen at Windsor and visited Sherwood Forest and Bolsover Castle during the visit. It was reported that the archduke is now "an appreciator of all things English".
Sarajevo last saw a royal visit in 1910 when the Emperor Franz Joseph visited the city, two years after Bosnia had controversially become part of the Austro-Hungarian Empire.
The emperor, 83, is one of Europe's longest reigning monarchs, having ascended to the throne in 1848. In recent months he has been suffering from illness. A health scare in April has increased speculation about Franz Ferdinand becoming emperor in the near future.
So this visit by his heir is aimed at strengthening the royal relationship with Bosnia.
Image source, Getty ImagesArchduke Franz Ferdinand (right) is the nephew and heir of Austro-Hungarian Emperor Franz Joseph
Image source, GoogleHis visit today to the Bosnian capital of Sarajevo is just the latest of his frequent journeys around Europe and beyond...
VIDEO: Royal correspondent Nicholas Witchell profiles the heir to one of Europe's oldest royal dynasties.
Watch the full report in the key video tab above.
The archduke struck a chord with the public in 1900 when he chose love over duty by marrying a lady-in-waiting, Countess Sophie Chotek.
The story of their marriage was front page news in Austria. As a member of the royal House of Hapsburg-Lorraine, he had been expected to choose a bride from a royal or princely family. His marriage to Sophie was finally permitted only on the condition that their children are barred from the Austro-Hungarian succession.
Sophie carries the title of Duchess but is denied certain privileges given to others of her rank. At home in Vienna, she is not allowed to ride in the royal carriage or sit in the royal box. But as the archduke is visiting Sarajevo in his military capacity as Inspector General of the Armed Forces, Sophie will be riding alongside her husband during today's procession.
Image source, Mary Evans Picture LibraryFranz Ferdinand with his wife Sophie and children Ernst, Sophie and Maximilian in 1910
Today is also the day the couple celebrate their 14th wedding anniversary.
VIDEO: Royal correspondent Nicholas Witchell on the royal couple's marriage.
Image source, Getty ImagesThe couple shortly after their wedding, aged 36 and 32 respectively
Watch the full report in the Key Video tab above.
Another anniversary is also being marked in the local region today - the feast day of St Vitus. For Bosnian Serbs, who make up 40% of the country's population, 28 June is a day of national commemoration. It marks the anniversary of the great Serb defeat to the Turks at the Battle of Kosovo in 1389. It is also celebrated for the legendary bravery shown by the Serbian soldiers in battle.
Sarajevo is sometimes called the 'Jerusalem of Europe' because it is home to three very distinct ethnic groups in Bosnian society.
VIDEO: Special correspondent Allan Little reports from Sarajevo on the significance of today's visit to the Bosnian capital.
Watch the full report in the Key Video tab above.
Crowds are now lining the streets in their hundreds along the main procession route, which has been decorated with flags and flowers.
The train is now pulling into Sarajevo station where the party will be met by General Oskar Potiorek, Military Governor of Bosnia-Herzegovina, and Sarajevo's Mayor Fehim Effendi Curcic.
Image source, TopfotoDignitaries and officers await the royal couple as the train pulls in to Sarajevo station
The archduke and duchess have now stepped out into the warm Sarajevo sunshine and are being greeted by dignitaries.
The archduke is dressed in the uniform of a general of the Hussars, wearing a blue tunic and a black helmet with distinctive green peacock feathers.
Image source, Getty/Time Life PicturesDuchess Sophie is wearing a white dress with a bright red sash, a fur of ermine tails and a wide-brimmed hat.
Image source, Mary Evans Picture LibraryThe couple have been greeted by a ceremonial guard of honour and the band of the 15th Army Corps has performed the Austrian national anthem.
The first stop on today's tour is a visit to City Hall for the official welcoming speeches with Mayor Curcic.
Afterwards the archduke will be attending an event at the National Museum before re-joining the duchess at the governor's residence for lunch.
They are paying a brief visit to the military barracks opposite the station, where the archduke will inspect the troops.
Image source, Topfoto