Tandulwadi Fort - Credit: Wikimedia Commons
Tandulwadi Fort is located near Saphale, 104 km north of Mumbai. Tandulwadi is not a fully built up fort, but a series of structures spread over the top of the mountain. The fort dates back 800 years and was primarily used as a watch tower over the surrounding plains. At a height of 1524 feet, it has views of the surrounding towns of Saphale, the Zanzorli lake, and the confluence of the Surya and Vaitarna rivers. Read more on Wikipedia
Source: en.wikipedia.org