The construction of the Ovcara Memorial Centre, worth two million kuna, was financed by the City of Zagreb.
The centre was opened by Deputy Prime Minister Jadranka Kosor and Zagreb mayor Milan Bandic.
"The most terrifying thing is that wounded soldiers and Vukovar hospital medical staff were tortured and killed here in the most horrifying way," Kosor said adding that among the Ovcara victims were two Radio Vukovar reporters - Sinisa Glavasevic and Branko Polovina.
"This place is a symbol of Croatia's holocaust and is binding for us all," Zagreb mayor Bandic said, adding that Ovcara was Croatia's Auschwitz and as such it must take a special place in Croatia's reality.
A commemoration ceremony marking the 15th anniversary of the Ovcara slaughter, was held earlier today. Numerous delegations laid wreaths and lid candles at the Ovcara mass grave. The ceremony was attended by many war veterans.
Deputy PM Kosor also opened a 1.1 kilometre-long section of the Ovcara-Grabar road, in which the government invested 1.5 million kuna.
By honoring the Ovcara Victims and opening the Memorial Centre, the marking of Vukovar Remembrance days and 15th anniversary of the fall of that eastern Croatian town ended.
The battle of Vukovar started on 25 August 1991. Some 1,800 Croatian soldiers fought back much stronger enemy troops for three months, until 18 November, when the defence lines were broken. During the siege some 15,000 people lived in the town, which was hit by 8,000-9,000 shells every day. According to data from the town hospital, 1,642 people were killed and 2,557 wounded in the attacks, while 22,000 Croats and other non-Serbs were sent into exile after the fall of the town.
Five hundred and ten people from Vukovar-Srijem County are still labeled as missing.