The correct answer is option 2: Gujarat. Gujarat is famous for step-wells, also known as `vav` or `baoli` in the local language. Step-wells are unique architectural structures that were built to collect and store water. These wells have a series of steps leading down to the water level, allowing people to easily access the water. Step-wells were not only practical water storage solutions but also served as important social and cultural spaces. Many of the step-wells in Gujarat are intricately carved and have become popular tourist attractions. They provide insights into the historical and architectural significance of the region. Although Maharashtra, Orissa, and Manipur have their own unique attractions, they are not particularly known for step-wells like Gujarat.