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 ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.