Polish Foreign Affairs Minister Jacek Czaputowicz attended observances on Sunday marking the 100th anniversary of the Treaty of Tartu, an Estonian-Soviet Russian peace treaty ending the Estonian War of Independence.
After being the bosses for decades in January 1920, the Germans relinquished control to the Poles.
The new-look building comes packed full of the latest technology that sets it a million-miles apart from its predecessor.
The 100th foundation anniversary of the Polish Olympic Committee was celebrated on Saturday in Kraków, south Poland, with a ceremonial renewal of the founding act.
One hundred years ago, on February 7 1919, a decree signed by Poland's inter-war strongman Józef Piłsudski founded the Postal Savings Bank, best known today under its abbreviated name PKO.
Out of PLN 240 million (EUR 56 mln) earmarked for celebrating the centenary of Poland regaining independence around PLN 64 million (EUR 15 mln) will be spent on the "foreign component," Deputy Prime Minister and Culture Minister Piotr Gliński said on Wednesday.
A November 10 concert at Warsaw's National Stadium will be among numerous events marking this year's Polish independence centenary, Kamil Wnuk, spokesperson for the centenary organisers, informed PAP on Wednesday.