Europe is home to a variety of cultural treasures. Lonely Planet, the world's largest travel guide publisher, has offered pairs of cities for culturehungry but timepoor travelers. London and Paris It takes you about two hours to travel from London to Paris by Eurostar, a high-speed railway service. The two capital cities have been competing in fashion, art and nightlife for decades-but each secretly looks up to the other. No one can doubt the grand and impressive beauty of Paris' Louvre Museum, but if you want to save money, you cannot skip the British Museum free to visit. Compared with London, Paris has more outdoor attractions such as the beautiful green walkway La Promenade Plantee. In Paris, you'll see diners linger over red wine. While in London, you can try some afternoon tea, eat fish and chips or salted cake. Vienna and Bratislava Austrian capital Vienna and Slovakia city Bratislava are an hour apart by train. But since they are linked by the Danube River, the best way to travel is by ship. A tour of the two cities is the perfect way to experience everything from 17th century's Habsburg dynasty splendor to scifi restaurants. Vienna is famous for Mozart and imperial palaces. You can appreciate the perfect blending of architecture and nature in the grand Schonbrunn Palace, and reward yourself with a cup of Vienna coffee, which has made its way to the world's cultural heritage list. Bratislava is best known for its fine dining-the remarkable UFO restaurant. You can enjoy a meatladen dinner here in an amazing setting. Lonely Planet recommends these two pairs of cities because   _  .
they are not expensive to visit they are best known to the world they are always enemies between each other they are close but different in many aspects