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"We have to return to our roots. Our world has abandoned God and Christianity," Robert Bakiewicz, head of a group organising the march, told the crowd.
The ruling Law and Justice Party may continue to govern alone after this weekend's election in Poland, but smaller parties are making gains.
Marek Kuchcinski from the ruling PiS party said he would resign after it was revealed that he used government aircraft for private trips by family members.
Poland is marking the 75th anniversary of the Warsaw Uprising during World War II.
It's 75 years since the Warsaw Uprising against the Nazi regime during WWII. Bohdan Dembinski was one of those who took part in the bloody 63-day battle. He told Euronews about the day it all started.
Thousands of people marched in Berlin and Warsaw on Saturday in support of LGBT rights on Saturday.
A fire broke out on the upper floors of an under-construction building in the Polish capital Warsaw on Friday night.
Polish far-right supporters protested against a US law that calls for the restitution of Jewish property.
Protesters in Poland on Monday demonstrated with bananas outside the National Museum in Warsaw against the removal of artworks deemed "indecent" by the museum's director.
On tonight's full episode of Raw Politics, panellists will be discussing the Venezuelan leadership lashing out at EU member states, the Spanish Prime Minister suffering a budget defeat, and Pompeo in Warsaw.
A group of politicians in Poland have proposed changing back Supreme Court reforms after they were criticised by the EU.
Warsaw bans nationalist march marking 100 years of Polish independence | Raw Politics
The Polish government's move to retire Supreme Court judges at 65 threatens to escalate the row with Brussels over judicial independence.
Scheduled to open in 2027, the new airport is hoped to become a regional hub and one of the largest international transfer airports in Europe.
How is the Polish capital establishing itself as a hub in which to live and invest?
Polish football fans unveiled a gigantic and provocative banner to mark a key date for the country in World War II.
Supporters of Legia Warsaw
Prince William and his family are in Poland and Germany to visit World War Two memorials and meet with locals
In major cities across Poland protesters condemn judicial changes which they say will kill judges' independence
Opposition protesters gather near the parliament in Warsaw to protest against the planned judiciary reforms announced by the ruling Law and Justice
In what has become the biggest political stand-off in Poland in years, opposition MPs have occupied parliament for a second day.
The rising number of successful businesses in Poland is leading to a thriving investment climate, that attracts more and more international and local startups and…
Two rival protest marches have brought tens of thousands of people onto the snowy streets of the Polish capital as the country marks Independence Day.
On the 96th anniversary of the Battle of Warsaw, Poles donned 1920s military uniform to re-enact a key moment from their past.
On July 8 and 9 the Polish capital will host the next NATO summit.
This is the Brief from Brussels, a round-up of the day’s top stories from across Europe.