Masuleh is a historic mountain village located in the Gilan Province of Iran. The village is situated in the Alborz mountain range, and it is known for its unique architecture, which has earned it the nickname "The City of Staircases." The village is a popular tourist destination due to its scenic beauty and cultural significance.

Masuleh is built on the slope of a mountain, and the buildings are constructed in a way that they form a stepped terrace. The roofs of the lower houses are used as the courtyards for the upper houses, which gives the village a layered appearance. The village's architecture is designed to protect it from the harsh weather of the region, including the frequent rains and snow.

The village has a rich history that dates back to the 10th century. It was once an important trading center on the Silk Road, and it played a vital role in the region's commerce and culture. The village has several historic sites, including a shrine, a mosque, and a mausoleum.

Masuleh is also known for its handicrafts, including carpets, rugs, and handmade pottery. The village has several shops and bazaars where visitors can purchase these items as souvenirs.