Superlatives- India

Highest Airport- Leh Air Port in Ladakh (3256 m/ 16080 ft high)
Largest Auditorium- Sri Shanmukhananda Hall, Mumbai
Largest Public Sector Bank- State Bank of india
Largest Botanical Garden - National Botanical Gardens in Kolkata
Longest River Bridge- Mahatma Gandhi Setu over the Ganga at Patna (5,575 m/ 8286 ft long)
Longest Sea Bridge- Anna Indira Gandhi Bridge connecting the island of Rameswaram with Mandapam in Tamil Nadu (2.34 km long)
Biggest Cantilever Bridge- Rabindra Setu (also called Howrah Bridge), Hoogli river in Kolkata (457 m/1499 ft long)
Longest Canal- Indira Gandhi Canal or Rajasthan Canal (959 km long)
Largest Cave- Amarnath (about 44 km from Pahalgam in Jammu and Kashmir)
Largest Cave Temple- Ellora (Maharashtra)
Oldest Church- St Thomas Church at Palayar in Trichur district in Kerala built in 52 AD.
Largest Church- Se Cathedral at old Goa, 10 km from Panaji.
Most Populous City- Mumbai
Longest Corridor- Corridor in Ramanathaswamy Temple at Rameswaram, Tamil Nadu ( 1220 m /4002 ft long)
Highest Dam- Bhakra Dam on Sutlej river in Punjab (226 m/ 738 ft high and 518 m/ 1699 ft long)
Longest Dam- Hirakund Dam on Mahanadi river in Orissa (24.4 km long)
Largest Delta- Sunderbans (75,000 sq km) formed by the Ganga and Brahmaputra in West Bengal and Bangladesh.
Largest Dome- Gol Gumbuz, Bijapur in Karnataka.
Highest Gateway Buland Darwaza at Fatehpur Sikri near Agra. Built by Akbar (53.5 m /175 ft High)
Longest Glacier- Siachen Glacier on the Indo-pakistan border (75.6 km long and 2.8 km wide)
Largest Gurudwara- Golden Temple at Amritsar
Highest Hydel Power Station- Rongtong Hydel Project in Kinnaur district of Himachal Pradesh.
Largest Lake- Wular lake, Kashmir
Largest Fresh Water Lake-Kolleru in Andhra Pradesh
Largest Library- National Library, Kolkata
Oldest Monastery- Buddhist Monastery, (situated at an altitude of 3,048 m /10,000 ft) at Tawang in Arunachal Pradesh.
Largest Mosque- Jama Masjid , Delhi (built by Shah Jahan in 1644-58)
Highest Mountain Peak- Kanchenjunga
Largest Museum- Indian Museum, Kolkata.
Largest Planetarium- Birla Planetarium, Kolkata.
Largest Prison- Tihar Jail, Delhi
Longest Railway Bridge- Dehri-on-Sone Railway bridge over the Sone river near Sasaram on Kolkata-Delhi main line Longest Passenger Train Route Jammu Tawi-Kanyakumari (3730 km) Fastest Train Shatabdi Express between New Delhi and Bhopal at a speed on 140 kmph
Longest Railway Platform- Kharagpur in West Bengal (833 m /2733 ft). Also world's longest Largest Refinery IOC Refinery at Koyah (Gujarat)
Largest Tribe- Gond
Largest Concentration of Scheduled Tribes- Madhya Pradesh
Largest Scheduled Caste- Community Chamar
Longest River- Ganga (2640 km long)
Longest Road- Grand Trunk Road from Kolkata to Delhi
Highest Road- Road at Khardungla in the Leh-Manali Sector
Largest State in Area- Rajasthan
Smallest State in Area- Goa
Most Populated State- Uttar Pradesh
Least Populated State- Sikkim
Most Densely Populated State- West Bengal
Least Densely Populated State- Arunachal Pradesh
Most Literate State- Kerala .
Most Women State- Kerala
Tallest Statue- Statue of Jain Saint Gomateswara at Sravanabelagola in Karnataka.
Largest Stupa- Great Stupa of Sanchi, Madhya Pradesh
Largest Tunnel- Jawahar Tunnel, Banihal Pass (Jammu and Kashmir) Largest Union Territory in Area- Andaman and Nicobar Island (8,249 sq km)
Smallest Union Territory in Area- Lakshadweep (32 sq km)
Most Populated Union Territory- Delhi (1,37, 82,976) Least Populated Union Territory- Lakshadweep (60,595)
Most Literate Union Territory- Lakshadweep
Highest Waterfall- Jog Waterfall, Karnataka
Largest Zoo- Zoological Gardens, Kolkata