The Treasury, or Al-Khazneh, is a magnificent ancient structure carved into rose-red rock and located in the UNESCO World Heritage site of Petra in Wādī Mūsá, Jordan. It's accessible by a picturesque walk through the Siq, a narrow and winding gorge, which takes about 20-30 minutes. Visiting early in the morning or late afternoon is ideal to avoid crowds and capture the best light for photography. Tickets for Petra are purchased at the entrance and cost around 50 JD for a single day, with multi-day tickets available for a discount. Consider visiting with a guided tour to gain deeper insights into the rich history, but it's also feasible to explore solo with the use of maps and guidebooks. The site is open year-round, but the best time to visit is during the cooler months from March to May or September to November. Allocate at least a full day to explore Petra, allowing enough time to appreciate The Treasury and other significant landmarks within this awe-inspiring archaeological site.