Delhi

Delhi is not a state but a Union territory — the National Capital Territory (NCT) — and within it sits New Delhi, the capital of India. For travellers the distinction matters little: this is one continuous, sprawling metropolis of more than 30 million people on the flat Gangetic plain, bounded on the east by the Yamuna River and crossed in the west by the low arc of the Delhi Ridge. It functions as India's pivot for arts, commerce, government, education and transit, and almost every overland or air journey through the north of the country passes through it.

What sets Delhi apart as a destination is the sheer density of history layered into the ground. The city is said to have been built and destroyed many times, and the remains of at least eight distinct settlements survive — from the 12th-century Qutub Minar and the ramparts of Qila Rai Pithora in Mehrauli, through Tughlakabad, Feroz Shah Kotla and Purana Qila, to Shah Jahan's walled Shahjahanabad (Old Delhi) and the colonial avenues of Lutyens' New Delhi. There are 174 ASI-protected monuments inside the territory, three of them UNESCO World Heritage Sites: the Qutub Minar complex, Humayun's Tomb and the Red Fort.

Delhi rewards travellers who dig past first impressions. Newcomers to large South Asian cities can find it chaotic, crowded and — for much of the year — polluted, but beneath the surface is a city of remarkable cultural depth, where Old Delhi's courtly traditions, Punjabi, South Indian and Bengali communities, monumental Mughal architecture and a modern museum-and-metro infrastructure all coexist. A comfortable hotel room and a willingness to slow down go a long way.

The pleasant window is roughly mid-October to mid-March. October and November bring clear, mild days; December and January are genuinely cold, with night temperatures dropping close to freezing, and are notorious for a thick winter smog that can cancel flights and delay trains. February and March are arguably the sweet spot — comfortable, drier and clearer.

Avoid April through June if you can: late spring and early summer are scorchingly hot, with daytime highs regularly above 40°C. The monsoon arrives around July and runs into September, bringing the year's heaviest rain (July and August each average over 200 mm) and high humidity, though it also greens the city and cuts the dust.

Air pollution is a year-round concern but peaks sharply after Diwali (October/November) and through the winter; travellers with respiratory sensitivities should check the daily air-quality index and consider a mask.

Major festivals worth timing a visit around include Republic Day (26 January), with its grand parade along Kartavya Path; Holi (March); Diwali (October/November); and the Qutub Festival of music and dance, traditionally held in the cooler months near the Qutub Minar.

Because Delhi is a single metropolitan territory rather than a region of separate cities, "getting around" means moving across the NCT and into its satellite towns rather than between distant hubs.

• Delhi Metro is the backbone — clean, air-conditioned, inexpensive and extensive, with colour-coded lines reaching Old Delhi (Chandni Chowk, Kashmere Gate), New Delhi (Connaught Place via Rajiv Chowk), South Delhi (Qutub Minar via the Yellow Line) and East Delhi (Akshardham via the Blue Line). The Airport Express links IGI Airport Terminal 3 to New Delhi station in about 20 minutes.
• Autorickshaws and taxis fill the gaps; app-based cabs and autos (Uber, Ola) avoid haggling. For metered autos, insist on the meter or agree the fare first.
• City buses (DTC and cluster buses) are cheap and cover the whole territory but are crowded and harder for first-timers to navigate.
• Rail and long-distance bus terminals — New Delhi, Old Delhi and Hazrat Nizamuddin stations, and the Kashmere Gate ISBT — are the jumping-off points for the wider region.

Distances within the NCT are modest but traffic is heavy: Old Delhi to the Qutub Minar in South Delhi is roughly 20 km but can take well over an hour by road, so the Metro is often faster. Prepaid tourist SIM cards with generous data are sold at the airport and convenience stores and make navigation apps painless.

• Old Delhi — the historic walled core, Shah Jahan's Shahjahanabad: Red Fort, Jama Masjid and the Chandni Chowk bazaars.
• New Delhi — the colonial-era capital of broad boulevards, Connaught Place and Khan Market shopping, India Gate and the Central Vista.
• South Delhi — upmarket neighbourhoods, malls and markets, and the Qutub Minar complex at Mehrauli.
• South East Delhi — Humayun's Tomb, Sunder Nursery, the Nizamuddin shrine and the ruins of Tughlakabad.
• East Delhi — across the Yamuna, anchored by the vast Akshardham temple complex.

Delhi is one of India's great eating cities, shaped by Mughal courtly cooking and waves of migration. Old Delhi is the heartland: Chandni Chowk and the lanes around Jama Masjid are famous for rich Mughlai fare — butter chicken, kebabs, korma and biryani — alongside crisp street snacks such as chaat, aloo tikki, chole bhature, dahi bhalla and the deep-fried breakfast nihari with khameeri roti. Paranthe Wali Gali is a much-photographed alley devoted to stuffed, griddled parathas.

Across the territory you will find regional cooking brought by Delhi's communities: hearty Punjabi food, South Indian dosas and idli around Karol Bagh and RK Puram, and Bengali sweets and fish in Chittaranjan Park (CR Park), the city's "mini Kolkata". Sweets are a serious business — try jalebi, rabri, kulfi and gajar ka halwa in winter. Tangy achar accompanies most thalis.

For travellers, options span everything from street stalls to the refined dining rooms of Khan Market and the five-star hotels. Vegetarian food is abundant and clearly labelled everywhere, and Jain (no onion/garlic) options are widely available. First-time visitors should favour busy, high-turnover stalls, drink sealed bottled water, and ease into street food gradually.

As a former imperial capital and a magnet for migrants from across North India and beyond, Delhi has an unusually layered culture. Old Delhi keeps alive the courtly traditions, crafts and Urdu literary heritage of the Mughal era, while neighbourhoods like CR Park, Karol Bagh and Munirka carry strong Bengali and South Indian identities. A large, diverse student population adds to the mix.

Key festivals through the year:

• Republic Day (26 January) — the national parade along Kartavya Path is the city's signature public event.
• Holi (March) — the festival of colours, celebrated exuberantly across neighbourhoods.
• Diwali (October/November) — the festival of lights, with markets, lamps and fireworks.
• Dussehra (September/October) — Ramlila performances and the burning of Ravana effigies, notably at Ramlila Maidan.
• Qutub Festival — classical music and dance staged in the cooler season near the Qutub Minar.
• Urs at Hazrat Nizamuddin — Sufi commemorations at the dargah, where qawwali singing on Thursday evenings is a year-round draw.

Delhi's arts scene is anchored by institutions such as the National Museum, the National Gallery of Modern Art and the crafts village of Dilli Haat, where regional handicrafts and food from across India are sold under one roof.

• The eight cities walk — trace Delhi's layered history across its surviving capitals, from the Qutub Minar and Mehrauli, through Siri, Tughlakabad and Purana Qila, to Shahjahanabad — an architectural circuit spanning eight centuries.
• Old Delhi on foot or by rickshaw — a cycle-rickshaw ride through Chandni Chowk to the Jama Masjid and Red Fort, threading spice markets, havelis and food lanes.
• Humayun's Tomb and Sunder Nursery — the garden-tomb that prefigured the Taj Mahal, paired with the restored Mughal-era gardens beside it, best in the late-afternoon light.
• Qawwali at Nizamuddin Dargah — Thursday-evening devotional Sufi singing in the candlelit courtyard of the 14th-century shrine.
• The Republic Day Parade (26 January) — military pageantry and tableaux from every Indian state processing down the Central Vista.