What are other attractions than Westminster Abbey that are worth visiting in London?

The other must-see attractions in London are:<a href='/tower-of-london-l2708/'>Tower of London</a><a href='/the-london-eye-l2711/'>The London Eye</a><a href='/sea-life-london-aquarium-l7677/'>Sea Life London Aquarium</a><a href='/kew-gardens-l5161/'>Kew Gardens</a><a href='/london-transport-museum-l7679/'>London Transport Museum</a>

What are the most popular Westminster Abbey tours and tickets?

The best Westminster Abbey tours and tickets are:<a href='/london-l57/london-london-by-night-sightseeing-open-top-bus-tour-t22275/'>London: London by Night Sightseeing Open-Top Bus Tour</a><a href='/london-l57/london-the-london-pass-with-access-to-80-attractions-t26207/'>London: The London Pass with access to 80+ Attractions</a><a href='/westminster-abbey-l2710/london-westminster-abbey-entrance-ticket-t399163/'>London: Westminster Abbey Entrance Ticket</a><a href='/london-l57/london-big-bus-open-top-hop-on-hop-off-sightseeing-tour-t5089/'>London: Big Bus Open-Top Hop-on, Hop-off Sightseeing Tour</a><a href='/london-l57/big-london-ticket-london-eye-big-bus-thames-river-cruise-t292175/'>Big London Ticket: London Eye, Big Bus & Thames River Cruise</a>