Must-see spots include The London Eye, Tower of London, Buckingham Palace, Big Ben / Houses of Parliament, British Museum, Natural History Museum, St. Paul’s Cathedral, Tate Modern, and Covent Garden.

Yes. Buying tickets ahead (for things like The London Eye, Tower of London, Madame Tussauds, etc.) lets you skip queues and often get discounted rates.

Free or inexpensive options include visiting British Museum, National Gallery, strolling in Hyde Park, exploring Trafalgar Square, walking along the Thames, and seeing Changing of the Guard at Buckingham Palace.

Spring (March-June) and Autumn (September-November) are ideal nice weather, thinner crowds, good rates on hotels and flights. Summer is busy & pricey; winters are cold and darker.

Great choices include Natural History Museum, Science Museum, London Eye, Sea Life London Aquarium, Harry Potter Studio Tour, and parks like Hyde Park and Kensington Gardens.