Machu Picchu is an awe-inspiring ancient Inca citadel requiring significant walking on uneven paths and steps, making it largely inaccessible for those with mobility issues; however, the journey involves a train to Aguas Calientes and a bus to the site, offering stunning views. Since 2017, visitors are required to enter with an official guide for their first entry, ensuring a comprehensive understanding of its history, though subsequent re-entries on the same ticket might allow for solo exploration within designated circuits. While open year-round, the dry season (May-October) offers clearer skies and better hiking conditions, albeit with larger crowds, whereas the wet season (November-April) presents lush landscapes but higher chances of rain and slippery trails, with the Inca Trail often closing in February for maintenance. Expect costs to be significant, with entry tickets, bus and train fares, and guide services easily totaling $150-$300+ USD per person just for the visit itself, excluding accommodation and international travel; booking all components, especially permits and train tickets, several months in advance is crucial. A typical visit duration inside the sanctuary is 2-4 hours, depending on the chosen circuit, though the entire journey from Cusco usually spans a full day or an overnight stay in Aguas Calientes to allow for an early morning visit. Other useful insights include acclimatizing to the altitude in Cusco beforehand, bringing your passport for entry, and packing essentials like water, sunscreen, and rain gear regardless of the season.