Pantheon - one of the most remarkable buildings in Rome - can be visited free of charge.
Window shopping is one of the most popular attractions in MIlan - and free of charge unless you decide to enter and spend your money on actual shopping. Galleria Vittorio Emanuele II is a must to visit place.
Sforzesco Castle, one of the most famous monuments in Milan, has seen long historical vicissitudes during the past years. It was demolished, then rebuilt several times, embellished and restored to become a symbol of both happy and dramatic events that are to be found in the historical background of the city. Sforzesco Castle today represents one of the most interesting and entertaining arts centres in Milan, housing several important art and history museums and libraries. Admission to the castle is free of charge, except entrance to museums. One of the top object - last sculpture by Michelangelo - Pieta Rondanini.
Baptistry of San Giovanni is one of the most ancient buildings in Florence. It is designed on an octagonal plan and encades in white and green marble. Spend your time here admiring the famous bronze doors portraying a sort of giant bible. For just 3 EUR you can get inside to experience the unique atmosphere inspired by a segmented cupola glowing with 13th century golden plated mosaics of Byzantine style. Here you will see a fresco of 1342 depicting the oldest known view of Florence.
Santa Maria del Fiore or Duomo - the main church in Florence is the third largest cathedral in the world (after St. Peter's in Rome and St. Paul's in London). Its construction begun in 1296 although it was completed only in 1436 and is mostly recognized by its famous dome created by Filippo Brunelleschi. You can visit Duomo for free, but be ready for long waiting to get in.
Located on Piazza della Signoria, Palazzo Vecchio has been the symbol of the civic power of Florence for over seven centuries and today is one of the most important tourist attraction in Florence. In front of Palazzo Vecchio you find a copy of Michelangelo's David, but go further - you enter a magnificent courtyard decorated with frescoes and fountain in it's center.
Ponte Vecchio is the oldest bridge in Florence dating back to 1345 and is one of a few medieval bridges in Europe with shops and workshops built on it. The Vasari corridor on top of the shops connects the Uffizi with the Pitti Palace on the other side of the river.
Basilica di San Simpliciano dates to Paleochristian times and is the best preserved of the city’s early Christian monuments. Inside this church are preserved some of the only Roman ruins in Milan.