Start your vacation in Madrid, the capital of Spain. Head to your hotel, take some rest, and enjoy the evening at a local restaurant to taste some traditional Spanish foods like paella, tortilla de patatas, and churros.
Visit the Royal Palace of Madrid, the largest palace in Europe, which has more than 3,000 rooms. Then, head to the Prado Museum, one of the best art museums in the world, and admire the works of Spanish artists like Velázquez, Goya, and El Greco.
Start your day at the Retiro Park, the most important park in Madrid, and visit its attractions such as the Crystal Palace and the boating lake. Then, spend the afternoon exploring the Puerta del Sol, the city's most famous square, and do some shopping in the nearby Gran Via area.
Take a flight to Barcelona and check-in at your hotel. Visit the famous Sagrada Familia, Antoni Gaudí's unfinished masterpiece, and enjoy the stunning views from its towers. Then, head to Park Güell, another Gaudí masterpiece, and admire its colorful mosaics and sculptures.
Start your day at the Gothic Quarter, the historic center of Barcelona, and visit its medieval churches, narrow streets, and cozy squares. Then, head to La Rambla, the city's most famous street, and have lunch at the Boqueria Market, where you can try a variety of local foods.
Visit Casa Batlló, another Gaudí masterpiece, and admire its colorful façade and unique interior design. Then, head to the Picasso Museum, which houses one of the most extensive collections of the works of Pablo Picasso. Finish your day at the Montjuïc Castle, where you can enjoy panoramic views of Barcelona.
Take a flight to Paris and check-in at your hotel. Visit the Louvre Museum, one of the world's largest museums, and admire its vast collection of art and artifacts, including the famous Mona Lisa. Then, head to the Eiffel Tower, the most iconic landmark of Paris, and enjoy the breathtaking views from its top.
Start your day at Notre-Dame Cathedral, one of the most famous cathedrals in the world. Then, head to the Champs-Élysées, the most famous avenue in Paris, and do some shopping and sightseeing. In the evening, enjoy a boat cruise on the Seine River and see the city's illuminated bridges and monuments.
Take a flight to Krakow and check-in at your hotel. Visit the Wawel Royal Castle, the former residence of Polish kings, and explore its magnificent chambers and halls. Then, head to the Main Market Square, the heart of Krakow's Old Town, and admire its colorful buildings, street performers, and souvenir shops.
If you have extra time, you can visit the Reina Sofia Museum in Madrid, the Gothic Cathedral in Barcelona, the Palace of Versailles in Paris, and the Auschwitz-Birkenau Museum in Krakow. To maximize your fun, try some local foods like tapas, pintxos, croissants, and pierogi, and attend some cultural events like flamenco shows, football matches, opera performances, and Christmas markets. Finally, don't forget to take lots of photos and souvenirs to remember your trip.