London is crammed full of famous places. Few cities in the world can match it when it comes to the number of tourist attractions per square foot, and it's such a short distance between everything - whatever you want to see, the chances are that you're only a short walk or bus ride away from it.

The best way to see London is simple: take a walk along the River Thames. The Thames has lots of amazing bridges, and they have a tendency to be right next to whatever it is you want to see.

Let's start out at Tower Bridge - arguably London's most famous bridge, with its opening middle to let through large ships. Just over this bridge is the Tower of London, the fortress where criminals were imprisoned centuries ago.

Carry on to the west, and you'll come to London Bridge, then Southwark Bridge, and then to the more recent Millennium Bridge. The Millennium Bridge is a feat of engineering, a suspension bridge held up by nothing but a set of steel cables. When it was first opened, it turned out to be a bit wobbly - but don't worry, they've fixed it now! The Millennium Bridge marks three great attractions in one place: the Tate Modern art gallery and Shakespeare's Globe Theatre on the south bank, and St Paul's Cathedral on the north side.

Keep going, and you'll come to Waterloo Bridge and just past there the London Eye on the south bank - the biggest Ferris wheel in the world, where you can get a great view of London.

You can finish your walk at Westminster Bridge, which has the most famous of all London's tourist attractions on its north side: Big Ben, and the Houses of Parliament. Go over the bridge and have a little look around, and you'll find that Westminster Abbey is nearby too.