There are many ways to get to Machu Picchu: Traditional Inca Trail, the Inca Jungle Trek, the Salkantay trail, or the train (just to name a few). However, everyone enjoys the ultimate day when they are exploring this majestic city that remained untouched by the Spanish invaders.
Most groups have a 2 hour tour of the city, but the best part is to find a place to sit, enjoy the view, and take in the site. There are a lot of tourists there, but if you go outside of the centre, you can easily avoid the masses… If you plan to go, be sure to also visit the Inca bridge and the sun gate - they are definitely worth it!! As for climbing Huayna Pitchu and/or Machu Picchu mountain, you now need to pay extra and reserve a place to have access to ascending them.
Here are two photosynths that give you a good view/sense of the city :)
Note: In 2007, Machu Picchu was voted one of the New Seven Wonders of the World in a worldwide Internet poll.