The Edinburgh Castle sits atop a volcanic rock in the city centre, like a grand old sentry keeping watch over the Scottish capital. You walk up to an esplanade that leads to a gigantic gate, through which you enter the compound. The place is divided into different sections, such as St Margaret's Chapel and the Argyle Tower, and detailed audio guides and descriptive pamphlets help you unravel the history of each spot. It's a place that 17-year-old student Avantika Khanna visited three years ago, when her father pointed out to her that the Red Fort in Delhi is double the size of the former abode of Scottish monarchs. This puzzled Khanna. "If the Red Fort is so much bigger, then why does it get less than half the visitors here?" she asked, before being told that the answer is simple. Outside of guides who can be hired, there are no free audio guides or informative pamphlets that visitors can rely on to learn more about the place, and since there's no one to pique it, their interest wanes as a result.

Gateway of India