A Chinese man stands alone to block a line of tanks heading east on Beijing's Cangan Boulevard in Tiananmen Square, on on June 5, 1989. The man, calling for an end to violence and bloodshed against pro-democracy demonstrators, was pulled away by bystanders, and the tanks continued on their way. More on this iconic image and the still-anonymous "tank man" here. #

A student displays a banner with one of the slogans chanted by the crowd of some 200,000 pouring into Tiananmen Square, on April 22, 1989 in Beijing. They were attempting to participate in the funeral ceremony of former Chinese Communist Party leader and liberal reformer Hu Yaobang, during an unauthorized demonstration to mourn his death. His death in April triggered an unprecedented wave of pro-democracy demonstrations. #

Students from Beijing University stage a huge demonstration in Tiananmen Square as they start an unlimited hunger strike as the part of mass pro-democracy protest against the Chinese government, on May 18, 1989. #

A striking Beijing University student is given first aid by medics at a field hospital in Tiananmen Square, on May 17, 1989, the fourth day of their hunger strike for democracy. #

Beijing police parade through Tiananmen Square carrying banners in support of striking University students, on May 19, 1989. The students were in the sixth day of their hunger strike for political reform. #

Pro-democracy demonstrators raise their fists and flash the victory sign in Beijing while stopping a military truck filled with soldiers on its way to Tiananmen Square on the day when then Prime Minister Li Peng declared Martial Law, May 20, 1989. #

An unidentified mother introduces her son to a soldier on an army truck, 8 kilometers west of Tiananmen Square, in Beijing, on May 20, 1989. Citizens had surrounded and stopped the force. #

Beijing University students listen as a strike spokesman details plans for a rally in Tiananmen Square, which they have occupied for the last two weeks, on May 28, 1989. #

A student from an art institute plasters the neck of a "Goddess of Democracy", a 10-meter-tall statue erected in Tiananmen Square on May 30, 1989. The statue was unveiled in front of the Great Hall of the People (right) and the monument to the People's Heroes (center) to promote the pro-democracy protest against the Chinese government. From a statement released by the art students who created the statue: "Today, here in the People's Square, the people's Goddess stands tall and announces to the whole world: A consciousness of democracy has awakened among the Chinese people! The new era has begun!" #

A huge crowd gathers to watch as student protestors burn copies of the Beijing Daily in retaliation for anti-student articles in front of the newspaper's offices, on June 2, 1989. #

A young woman is caught between civilians and Chinese soldiers, who were trying to remove her from an assembly near the Great Hall of the People in Beijing, on June 3, 1989. #

Pro-democracy protesters link arms to hold back angry crowds, preventing them from chasing a retreating group of soldiers near the Great Hall of the People, on June 3, 1989 in Beijing. Protesters were angered by an earlier attack upon students and citizens using tear gas and truncheons. People in the background stand atop buses used as a roadblock. #

A huge crowd gathers at a Beijing intersection where residents used a bus as a roadblock to keep troops from advancing toward Tiananmen Square in this June 3, 1989 photo. #

People's Liberation Army (PLA) soldiers leap over a barrier on Tiananmen Square on June 4, 1989, during heavy clashes with people and dissident students. The PLA was reportedly under orders to clear the square by 6:00 am, with no exceptions. #

The driver of an armored personnel carrier that rammed through student lines, injuring many, lies dead after being beaten by students who set his vehicle on fire during an army attack on Tiananmen Square, on June 4, 1989. #

Civilians hold rocks as they stand on a government armored vehicle near Chang'an Boulevard in Beijing, early on June 4, 1989. Violence escalated between pro-democracy protesters and Chinese troops, leaving hundreds dead overnight. #

Taken care by others, an unidentified foreign journalist (2nd from right) is carried away from the clash between the army and students near Tiananmen Square, on June 4, 1989. #

A rickshaw driver fiercely pedals wounded people to a nearby hospital, with the help of bystanders, on June 4, 1989. PLA soldiers again fired hundreds of rounds towards angry crowds gathered outside Tiananmen Square at noon. #

A handcuffed man is led by Chinese soldiers on a street in Beijing, in June of 1989, as police and soldiers searched for people involved in the April-June pro-democracy protests. #

(1 of 2) Three unidentified men flee as a Chinese man, background left, stands alone to block a line of approaching tanks, in Beijing's Tiananmen Square, on June 5, 1989. The man in the background stood his ground and blocked the column of tanks when they came closer, an image captured on film by numerous other photographers and one that ultimately became a widely reproduced symbol of events there. #

A crowd of Chinese clears a path to give a busload of foreign tourists a view of a dead body of victim of the first night of violence as People's Liberation Army troops shot their way into Tiananmen Square to crush pro-democracy protests, on Monday morning, June 5, 1989. #

A truck drives Chinese soldiers down Chang'an Boulevard in Beijing, on June 5, 1989, one day after violence between government troops and pro-democracy protesters left hundreds dead. #

Chinese onlookers run away as a soldier threatens them with a gun on June 5, 1989 as tanks took position at Beijing's key intersections next to the diplomatic compound. #

A Beijing resident on the west side of Tiananmen Square shows a slug from the automatic rifle fired by the army that went through his flat's window in central Beijing. #

People on Chang'an Boulevard in Beijing hold up a photo that they described as dead victims of the violence against pro-democracy protesters on Tiananmen Square, on June 5, 1989. #

Beijing residents inspect the interior of more than 20 armored personnel carriers burned by demonstrators to prevent the troops from moving into Tiananmen Square, on June 4, 1989. #

Zhang Xianling holds a photo of her late son, Wang Nan, who was killed in the 1989 Tiananmen Square crackdown, during an interview in Beijing, on May 28, 2012. Zhang said her friend Ya Weilin, a father of a man killed in the 1989 crackdown had committed suicide on May 25, 2012, out of despair and to protest the government's long-standing refusal to address the grievances of the victims' relatives. #

Tens of thousands of protesters take part in a candlelight vigil in Hong Kong's Victoria Park to mark the 23rd anniversary of the military crackdown on the pro-democracy movement at Beijing's Tiananmen Square in 1989. Photo taken on June 4, 2012. #

People take part in a candlelight vigil in Hong Kong on June 4, 2012, held to mark the crackdown on the pro-democracy movement in Beijing's Tiananmen Square in 1989. Hundreds, perhaps thousands, are believed to have died when the government sent in tanks and soldiers to clear Tiananmen Square, bringing a violent end to six weeks of pro-democracy protests. #