There are many lamas running around Machu Picchu. They have been put there but it is still nice to see em.
This is perhaps the most famous place inside MP, apart from the Wayna Picchu silhouette. It was the temple dedicated to the Sun God and it is the only round building in the site.
Aguas calientes = hot waters...refering at the hot thermal bathes here. After walking 3 or 4 days through teh mountains there is absolutely NOTHING better than relax in these bathes.