Mumbai, Italy
Built by the Portuguese in 1640 to mark the southernmost tip of the mainland (i.e. Salsette island). Not much remains. - It was built as a watchtower overlooking Mahim Bay, the Arabian Sea and the southern island of Mahim. Castella de Aguada has been featured in several Hindi films.
Listen to the audio guide for Bandra Fort Gate Free on WIP — starts by itself when you arrive, even with the screen off