Viewfinder: Hong Kong Marks 30 Years Since the Tiananmen Square Massacre
People hold candles as they take part in a candlelight vigil at Victoria Park on June 4th, 2019, in Hong Kong, China.
Viewfinder: Victims and Families Mark the Second Anniversary of the Manchester Arena Bombing
Two women hug while a two-minute silence is observed in memory of the victims of the Manchester Arena Bombing in Saint Anne's Square on May 22nd, 2019, in Manchester, England.
Viewfinder: Commemorating the Violent End of Ukraine's Revolution
An activist pays tribute at a memorial for the more than 100 Maidan activists who were killed during the 2014 Ukranian revolution, at a memorial event near Independence Square in Kiev, Ukraine, on February 20th, 2019.
Viewfinder: Commemorating Genocide Around the World
Six hundred candles in the form of the Star of David are set out on the floor during an event to commemorate Holocaust Memorial Day in the Chapter House at York Minster on January 24th, 2019, in York, England.
Viewfinder: Crosses Mark the Las Vegas Massacre Anniversary
Retired carpenter Greg Zanis, who installed 58 crosses last year—one for each person killed—set up the memorial again with new crosses for the massacre's anniversary.
Marking the 50th Anniversary of Martin Luther King Jr.'s Death in Atlanta
Hours before a televised ceremony, the sites of King's crypt and church saw a steady stream of visitors.
Viewfinder: A Celebration of the 250th Year of Modern-Day Circus in London
Circus artists perform on Westminster Bridge to mark the 250th anniversary of the modern-day circus ahead of a reception in the Houses of Parliament on March 6th, 2018, in London, England.