This landmark is, of course, an iconic place in Mumbai. Probably the most touristic place in the city. When I saw the gates of India in the photo, I didn't think they were so high. The monument, which has been pleasing tourists from all over the world for so long (since 1924), is very impressive.
You can also buy a lot of souvenirs on the square. Among the tourists, not only foreigners visit this place, but also a lot of Indians from other states, who are mesmerized by watching and taking pictures at the gates.
There are also many shops and cafes and restaurants nearby, you won't stay hungry)
If you are in Bombay, aka Mumbai, then a couple of places worth visiting are Cafe Leopold (for those who read Shantaram) and here. It is beautiful, monumental, and very impressive. Large open space, beautiful architecture, always crowded. To get there by metro and taxi