What is it?

Delhi is not one city but at least seven, layered over each other across a thousand years of conquest, empire and reinvention. In Old Delhi you'll be swept along the lanes of Chandni Chowk, where the scent of frying jalebis and freshly ground cardamom mingles with diesel fumes, and the call to prayer rolls off the vast sandstone courtyard of Jama Masjid. A few kilometres south, New Delhi opens into the wide, tree-lined avenues of Lutyens' colonial capital, sweeping from India Gate to Rashtrapati Bhavan. Scattered between them are the ruins of vanished dynasties: the soaring 73-metre Qutub Minar, the ghostly stepwell of Agrasen ki Baoli, and Humayun's Tomb, the red-and-white Mughal masterpiece that inspired the Taj Mahal. What makes Delhi unique among Indian cities is this sheer density of history and humanity — Sufi qawwali singers at Nizamuddin Dargah on a Thursday night, Sikh volunteers ladling free food to thousands at Bangla Sahib, and a food scene that stretches from 100-year-old paratha stalls to some of Asia's finest restaurants.

Where is it?

Delhi sits in northern India on the banks of the Yamuna River, forming the northern point of the classic Golden Triangle with Agra and Jaipur. The main draws cluster in Old Delhi (Chandni Chowk, Jama Masjid, Red Fort), central New Delhi (India Gate, Connaught Place, the National Museum) and South Delhi (Hauz Khas, Qutub Minar, Mehrauli, Lodhi Gardens), all linked by a clean, cheap and remarkably efficient metro. Visit between October and March when the weather is crisp and comfortable; avoid May and June, when temperatures push past 45°C, and be aware that air quality is at its worst in November and December.

What makes it worth it?

Delhi overwhelms before it seduces — almost every traveller describes the first day as sensory overload and the last as reluctant departure. There is a particular kind of magic in eating a plate of chaat you'll still be thinking about years later, or sitting cross-legged among strangers at the Nizamuddin shrine as the qawwali builds and the whole courtyard sways. It is a city that dismantles assumptions: you'll see extraordinary wealth beside extraordinary hardship, ancient ritual beside start-up ambition, and find generosity in the most unexpected corners. "It broke my brain and then rebuilt it," is a sentiment travellers repeat often, and many say Delhi taught them more about India in three days than a week anywhere else. What stays with you isn't a single monument but the texture of it all — the cycle-rickshaw weaving through Chandni Chowk at dusk, the smell of marigolds, the hot chai in a clay cup at dawn.

How accessible is it?

Delhi is one of the easiest Indian cities to reach, with Indira Gandhi International Airport serving direct flights from across the world and welcoming over 70 million passengers a year. Most nationalities need a visa, but India's e-Visa system is straightforward and issued online in a few days for roughly $25–$80. Costs are low: hostels from $8 a night, mid-range hotels $30–$80, luxury heritage properties $200+, while street meals cost a couple of dollars and metro rides pennies. Physically it's undemanding, though the heat, crowds, pollution and constant noise are genuinely tiring — build in rest, drink only bottled or filtered water, and consider a guided walking tour or food tour for your first day to ease in. Ride-hailing apps work well and are the simplest way to avoid tuk-tuk haggling; women travelling solo should stick to reputable transport after dark, as Delhi requires more street-smarts than most Indian cities.