Machu Picchu, the iconic Inca citadel, is a must-see destination in Peru. Accessibility can be challenging, involving a train journey to Aguas Calientes followed by a bus ride or a hike. Solo visits are possible, but guided tours are highly recommended to fully appreciate the site's history and significance. The dry season (May to September) is the best time to visit, though it's also the busiest. Be aware that there are daily limits on the number of visitors and specific time slots, requiring advance booking. The cost, including transportation, entrance fees, and a guide, typically ranges from $300 to $600 USD per person. A typical visit lasts 4 to 6 hours, excluding travel time to and from Aguas Calientes. Altitude sickness is a common concern, so acclimatizing in Cusco beforehand is crucial. Consider purchasing tickets and booking accommodations well in advance, especially during peak season.