Machu Picchu, the iconic Inca citadel nestled high in the Andes Mountains, is a must-see for history buffs and adventure seekers. Accessibility can be challenging, involving train or bus rides from Cusco followed by a bus up to the site entrance or a multi-day hike along the Inca Trail. While solo exploration is possible with a purchased ticket, a guided tour is highly recommended to fully understand the site's history and significance. Note that entrance tickets must be purchased in advance, and there are often timed entry slots and daily visitor limits. The dry season (May-September) offers the best weather, but it's also the busiest; the rainy season (November-March) can bring slippery conditions and occasional closures. Costs can vary greatly depending on your travel style, but expect to spend at least $300-$1000+ per person, including transportation, accommodation, entrance fees, and potentially a guided tour. A typical visit to the site itself lasts around 3-5 hours, but allow at least a full day for travel to and from Aguas Calientes (Machu Picchu Pueblo).