Mumbai moves fast, so a short visit works best when it is anchored around a handful of icons. The Gateway of India remains the city's grand welcome, its waterfront arch facing the Arabian Sea beside the colonial-era Taj hotel. From there it is an easy walk into Colaba, followed by the Gothic spires of Chhatrapati Shivaji Terminus, a working railway station and UNESCO landmark in one. Add the offshore rock-cut shrines of Elephanta Caves and an evening stroll along Marine Drive as the lights come on, and you cover history, faith, and the city's restless energy without wasting a single day.