The Monastery, also known as Ad Deir, is a monumental sandstone structure in Petra, Jordan, comparable in size to the more famous Treasury. Reaching the Monastery involves a challenging uphill hike of approximately 800 steps, making it less accessible to those with mobility issues; consider taking a donkey ride for a fee. While solo visits are possible, a guided tour can enhance your understanding of its history and significance. The best time to visit is during the cooler months (spring or autumn) to avoid extreme heat. Entry to Petra, which includes the Monastery, requires purchasing a Petra ticket, with costs varying depending on the duration of your visit; expect to pay around $70-$100 USD for a one-day pass. Budget extra for the donkey ride if needed. Allocate at least half a day (3-5 hours) to fully experience the Monastery, including the hike.