The Treasury (Al-Khazneh) is the iconic facade within the ancient city of Petra, Jordan, accessible primarily by walking through the magnificent Siq, a generally flat path suitable for most visitors, though the overall site is vast and requires good mobility. While self-guided exploration is feasible with maps and signage, hiring a local guide significantly enhances the experience with historical context. Petra is open year-round, but spring (March-May) and autumn (September-November) offer the most pleasant weather, avoiding the extreme heat of summer or occasional chill of winter; a special 'Petra by Night' experience is available on select evenings. Entry costs typically range from 50-60 JOD for a multi-day pass for non-residents staying overnight in Jordan (day-trippers without an overnight stay pay more), with guide services costing extra. Most visitors allocate a full day (6-8 hours) to explore the broader Petra site, with ample time for viewing The Treasury and continuing deeper into the archaeological park; comfortable walking shoes, water, and sun protection are essential for this desert wonder.