Buckingham Palace, Big Ben, London Eye, Trafalgar Square, Downing Street, Hyde Park and Speaker's Corner, Tower of London, Tower Bridge, Westminster Abbey, St Paul's Cathedral, British Museum, National Gallery, Harrods department store are all within London. Outside London is Windsor Castle, Stonehenge and Stratford upon Avon. It really depends on your personal interests.
That depends on the type of things that interest you. For example, there would be no point in visiting art galleries if you're not interested in art. However, most tourists visiting London would probably want to see Buckingham Palace, Big Ben, London Eye, Tower of London, Tower Bridge, Downing Street, Trafalgar Square, St Paul's Cathedral, Westminster Abbey, British Museum, National Gallery, Windsor Castle.
There is no interesting places to visit in California.
Grand Canyon, London Bridge and Hoover Dam.
Interesting place to visit in Bolivia
Every place that you can visit in Antarctica is 'interesting' at least to the people who manage the visit.
Botswana.
There are many scenic and interesting places to see while in Washington. Chinook Pass, Cascade Valley, and Sherman Pass are great places to visit.
the beaches
well
Disneyworld!
yes there are
The cathedral is famous there.
Adventure land