Worli, Mumbai
A modest 17th-century fort built by the British East India Company on Worli Hill to guard Bombay's harbour approaches from Maratha naval raids. Now largely in ruins, its remaining walls sit atop one of Mumbai's highest natural points, overlooking the Arabian Sea and the Bandra-Worli Sea Link. It has become a popular, low-key sunset spot among locals rather than a formal tourist attraction. There is no entry fee or fixed visiting infrastructure.