Poland 2000 - National Pilgrimage

Two stamps issued by Poland in 2000 (Michel PL3844-5).

The Latin inscriptions read:  

"Thee, O God, we praise"

and

"The cross stands while the world keeps turning".

On Good Friday, at 9.15pm, the "Way of the Cross" starts at the Colosseum.  The Pope, and onlookers, follow the Stations of the Cross from the Colosseum to the Palatine Hill in a torch-lit procession.  
This is a spectacular event to attend if you happen to be in Rome at that time, regardless of your religious affiliation.

Poland 1990 - Football World Cup Italy '90

A stamp issued in Poland in 1990 for the Football World Cup in Italy.
The First Day Cover issued on 08 June 1990 in Warsaw.

Poland 2006 - Capitals of European Union Countries, Rome

First Day Cover issued in Warsaw on 09 October 2006. 
This stamp is part of a series of five depicting European Capitals:  Berlin, Rome, Stockholm, Tallin, Valetta.  (http://www.wnsstamps.ch/en/stamps?search[like]=PL046.06).