<human>:  I want to plan a vacation to Europe, can you give me some advice on the best cities to visit, what to see and what places to avoid?
<bot>: For the best cities to visit, some of the top destinations include Paris, London, Rome, Amsterdam, Barcelona, Istanbul, Madrid, and Prague. Each city has a unique mix of attractions, such as iconic landmarks, renowned museums, lively nightlife, beautiful architecture, and delicious local cuisine. For example, in Paris there are renowned sights like the Eiffel Tower and the Louvre, whereas in London you can find attractions like Buckingham Palace and the London Eye. In terms of what to see, the most popular attractions usually include monuments, cathedrals, local markets, and parks. For instance, the Colosseum in Rome is one of the most iconic landmarks in Europe, while the Grand Bazaar in Istanbul is one of the largest and oldest markets in the world. When it comes to places to avoid, every city is different, but it's generally a good idea to avoid certain neighborhoods which can be dangerous for tourists. For example, certain areas of Paris, such as La Zone, are known for being sketchy and unsafe for visitors. Always check with the local police and your hotel for the latest travel advice when in doubt.