Jantar Mantar
Thirteen stone instruments built in 1724 to track the Sun, Moon, and planets — no telescope, just the naked eye.
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The first of five observatories Maharaja Jai Singh II built across India, Delhi's Jantar Mantar was designed to compile astronomical tables and predict celestial movements. The name translates as "instruments for measuring the harmony of the heavens" — and the architecture IS the instrument, not a building around one.
What to look for
- The Samrat Yantra and Ram Yantra — two of the four distinct named instruments within the complex
- The Jai Prakash Yantra and Misra Yantra, the other two named structures on site
- A plaque fixed to one structure in 1910 that incorrectly dates construction to 1710 — later research established 1724 as the actual year
One of five Jantar Mantars in India; the others are in Ujjain, Mathura, Varanasi, and Jaipur — Delhi's was the first built.
Jantar Mantar is one of 35 sights worth the detour in Delhi, all bundled offline in Voyage GO — download the Delhi pack and it sits on your map with no signal, filling your travel passport the moment you walk past.
More to see in Delhi
- Red FortThe ramparts where Jawaharlal Nehru raised India's flag on 15 August 1947 still host that ceremony every Independence Day.
- Qutb MinarSuccessive dynasties handed this tower off across 170 years — Aibak started it in 1199, Firuz Shah Tughlaq capped it with a cupola in 1368.
- Humayun's TombThe red-sandstone ancestor of the Taj Mahal — commissioned by an empress, designed by Persian architects, and finished a century before Agra.
- Jama MasjidShah Jahan built his imperial mosque at the highest point of Shahjahanabad — the Mughal capital — and it was regarded as a symbolic gesture of Mughal power across India.
- Lotus TempleTwenty-seven marble petals, grouped in threes, fold into a single hall where any person of any faith walks in without condition.
- India GateAround 13,300 names carved in stone — soldiers lost across Gallipoli, Mesopotamia, and the Afghan frontier.