• Highest Straight Gravity Dam

  Ans :  Bhakra Dam(India), 740 ft.

• Most populous City in the world

  Ans :  Shanghai

• Largest Dam

  Ans :  Kariba (Rhodesia),149000000 acre ft.in volume

• Biggest Library

  Ans :  United states Library of congress,Washington D.C. Containing over 41874900 titles.

• Longest Cantilever Bridge

  Ans :  Quebec (Over St.Lawrence River,Canada),3239 ft.in length.

• Biggest Zoo

  Ans :  Etosha Reserve(S.W.Africa),38500 sq.miles

• Highest Airfield

  Ans :  Ladakh Airfields (Kashmir,India),14230 ft.above sea-level.

• Biggest Auditorium

  Ans :  Municipal Auditorium at Atlantic City (U.S.A.),covers an area of 7 acres.

• Largest Reflector Telescope

  Ans :  Mt.Semirodriki (U.S.S.R.)

• Biggest Railway Station

  Ans :  Grand Central Terminal(New york),with 47 platforms,48 acres in area.

• Largest Mosque

  Ans :  Jumma Masjid (Delhi),Over 10000 sq.ft. in area

• Largest Pearl

  Ans :  Pearl of Allah,weighs 14 lbs.2 oz.

• Biggest Stadium

  Ans :  Strahov Stadium (Prague),accommodates 240000 spectators.

• Longest Suspension Bridge

  Ans :  Verrazano-Narrows, 13700 ft.long,USA

• Longest Road Highway Tunnel

  Ans :  St.Goldhard(Switzerland),10.01 miles

• Largest Diamond

  Ans :  Cullinan(Over 1 1/2 lbs.)

• Largest Office building

  Ans :  Pentagon (Arlington,U.S.A.),over 34 acres of floor area.

• Biggest Hotel

  Ans :  Conrad Hilton (Chicago,U.s.A.), has 25 floors.

• Largest Dome

  Ans :  Astrodome in U.S.A.;outside diameter is 216 metres.

• Tallest Tower

  Ans :  Tokyo Tower (Japan) 1000 ft.high

• Longest Dam

  Ans :  Hirakund(India),15.8 miles

• Tallest Statue

  Ans :  Motherland, an enormous female figure (U.S.S.R.)

• Largest Church

  Ans :  Basilica of St.Peter,Vatican City,611 ft.in length and 18110 sq.yds.in area.

• Longest Railway Line

  Ans :  Trans-siberian Railway (USSR) connecting Moscow to Vladivostok

• Longest Railway Platform

  Ans :  Kharagpur(India),2733 ft.

• Largest Thoroughfare

  Ans :  Broadway (New York)

• Tallest Church

  Ans :  Ulm Cathedral (Ger.),529 ft.high

• Highest Lighthouse

  Ans :  Bishop Rock (England), 146 ft.high

• Largest Bell

  Ans :  Tsar Kolokol at Kremlin (Moscow),weight 193 tons

• Longest Port

  Ans :  New York Harbour (U.S.A.)

• Highest Dam

  Ans :  Rogusky (U.S.S.R.),1066 ft.

• Largest Diamond Mine

  Ans :  At Kimberly,South Africa

• Deepest Boring

  Ans :  An oil well of 25340 ft.(Texas, U.S.A.)

• Largest University Building

  Ans :  Lomonosov University (Moscow), has 32 stories

• Tallest Building

  Ans :  Sears Tower(Chicago), 442 m.

• Largest Park

  Ans :  Yellowstone National Park (USA)

• Largest Merchant Ship

  Ans :  Pierre Guillaumat (france),555031 DWT Tonnage

• Largest Indoor Theatre

  Ans :  Radio City Music Hall (New York),accommodates 6200 persons.

• Largest Temple

  Ans :  Angkor-Vat (Cambodia), 1400 yds. by 1400 yds.

• Longest Railroad Tunnel

  Ans :  Seikan (Japan),33.5 miles

• Largest Passenger Ship

  Ans :  Queen Elizabeth II (83000 tonnes)(U.K.)

• Largest Hydro-electric Plant

  Ans :  Krasnoyarsk (USSR),6096 M.W. capacity

• Longest Corridor

  Ans :  Rameshwaram Temple's Corridor (India),400 ft.

• Highest Suspension Bridge

  Ans :  Over royal Gorge (Colorado,U.S.A.),1053 ft.high

• Biggest Museum

  Ans :  American Museum of Natural History has an area of 23 acres.

• Longest Seaway

  Ans :  St.Lawrence seaway(U.S.A.-Canada),189 miles

• Largest Sculptures

  Ans :  Mount Rushmore National Memorial(Black Hills,S.Dakota,U.S.A.)

• Longest Viaduct

  Ans :  Lake Panchhartrain Causeway (Louisiana,U.S.A.), with a total length of 24 miles

• Longest recognised swimming course

  Ans :  English Channel (23 miles,calais to Dover)

• Longest Wall

  Ans :  Great Wall of China(1400 miles)