Visit the Colosseum, one of the most iconic structures in Italy built in 80 AD, and the Pantheon, a former Roman temple now a church, built in 118 AD. Next, head to the Trevi Fountain, enjoy some gelato or an Italian coffee, and toss a coin in the fountain. Your last stop of the day will be the Roman Forum, an ancient site where you can see the remains of important government buildings and public spaces.
Spend the day in Florence, the birthplace of Renaissance art and culture. Visit the Duomo, a stunning cathedral with a terra-cotta-tiled dome, the Uffizi Gallery, home to famous Italian artworks like Botticelli's "The Birth of Venus", and Ponte Vecchio, a historical bridge lined with shops.
Start your day at the Rynek Glowny, a medieval market square filled with stalls and local shops where you can buy souvenirs. Then, visit the Wawel Castle, the centrepiece of the old town and a symbol of Poland's independence, which now houses museums, art collections, and a dragon's den. End your day by exploring the Kazimierz, the old Jewish quarter of Krakow that has a rich history and unique atmosphere with many cosy cafes and restaurants.
Visit the Market Square, the heart of the city, and take a stroll around the Ostrow Tumski, the oldest part of Wroclaw where you can see the impressive Cathedral of St. John the Baptist. Next, head to the Japanese Garden, a hidden gem in the city where you can relax and enjoy the serene surroundings. End your day by taking a walk along the Oder river and watching the sunset.
Visit the Powiśle district, which is popular among the younger generation of Warsaw locals. Then, head to Old Town, which has a rich history and beautiful architecture. Next, visit the Lazienki Park, Poland's largest park and gardens, featuring various beautiful statues and monuments such as "Chopin's monument". End your day with cocktails at the 360 Bar, which offers a panoramic view of Warsaw from its rooftop.
If you have more time in Italy, consider visiting Venice or Naples. In Poland, you could visit Gdansk or Zakopane. If you are on a tighter budget, you can save money by eating at local markets or food trucks in Italy, or at milk bars - a type of cafeteria that was prevalent during communism - in Poland.