Romantic Eiffel Tower
Louvre Museum
Notre Dame Cathedral
Palace of Versailles
Grand Place
Charming Canals
Rijksmuseum
Anne Frank House
Brandenburg Gate
Checkpoint Charlie
Schonbrunn Palace
Vienna State Opera
Grand Canal
St. Mark's Basilica
If you have more time, consider adding a day trip to the Palace of Fontainebleau or Mont Saint-Michel. If you have less time, consider skipping Vienna and going straight to Venice. Keep in mind that some attractions may require advanced booking or have limited opening hours, so plan accordingly.