The Tomb of the Unknown Soldier is dedicated to the unknown soldiers who have given their lives for Poland. It is one of many such national tombs of unknowns that were erected after World War I, and the most important such monument in Poland.
The monument, located at Piłsudski Square, is the only surviving part of the Saxon Palace that occupied the spot until World War II. Since 2 November 1925 the tomb houses an unidentified body of a young soldier who fell during the Defence of Lwów. At a later date earth from numerous battlefields where Polish soldiers have fought was added to the urns housed in the surviving pillars of the Saxon Palace.
The Tomb is constantly lit by an eternal flame and assisted by a guard post by the Representative Battalion of the Polish Army. It is there that most official military commemorations take place in Poland and where foreign representatives lay wreaths when visiting Poland.
The changing of the guard takes place on the hour of every hour daily and this happens 365 days a year.
References:The Cathedral of Saint Mary Major, often called Lisbon Cathedral or simply the Sé, is a Roman Catholic cathedral located in Lisbon, Portugal. The oldest church in the city, it is the seat of the Patriarchate of Lisbon. The cathedral has survived many earthquakes and has been modified, renovated and restored several times. It is nowadays a mix of different architectural styles.
The site where it stands was the principal mosque of Lisbon when it was an Arab settlement. The construction of the cathedral started around 1150, three years after the city was conquered from the Moors during the Second Crusade. Shortly after the victory the English knight Gilbert of Hastings was named bishop of the city of Lisbon.
One good reason to visit the Cathedral is to visit its charming cloisters located in the back. There are several tombs in the cathedral, the most notable of which is the beautifully sculpted tomb of Lopo Fernandes Pacheco and his wife.