1) At 1,250 ft. the Empire State Building was by far the tallest building in the world for more than 40 years.

2) The building’s most astonishing feat however, was the speed in which it rose into the New York City skyline.

3) Construction was completed in only one year and 45 days, without requiring overtime.

4) Ironworkers set a torrid pace, riveting the 58,000-ton frame together in 23 weeks.

5) While just below them, masons finished the exterior in eight months, and plumbers laid 51 miles of pipe and electricians installed 17 million ft. of telephone wire.

6) The building was so well-engineered that is was easily repaired after a bomber crashed into it in 1945.

Click here to check out the pictures of other skyscrapers

1) The Golden Gate Bridge remains the world’s tallest suspension bridge after more than 60 years of its completion

2) It is hanging from two 746-ft-high towers with the help of yard thick cables.

3) In fact, the Golden Gate Bridge contains enough cable to encircle the earth three times.

4) To leap across the mouth of an ocean harbor, something never before accomplished, civil engineers planted one pier in the open sea, 1,000 ft. from the shore.

5) The Construction was completed in a record time of 4 year’s

6) It survived the 1989 Loma Prieta earthquake, and weather has shut it to traffic only three times in 60 years.

7) Currently the span is undergoing a seismic retrofit to withstand a 90-second earthquake that measures 8.3on the Richter scale.

8 ) This bridge is a perfect combination of engineering and beauty and thus Golden Gate Bridge remains one of the world’s most photographed bridges.

Click here to check out the pictures of other bridges

1) The Panama Canal is one of civil engineering’s greatest triumphs in which more than 42,000 workers played there role.

2) They moved enough earth and rubble to bury the island of Manhattan to a depth of 12 ft. — or enough to open a 16-ft.-wide tunnel to the center of the Earth.

3) The canal was finished on time and within budget. But after completion, a challenge remained: how to tame the flood waters of Chagres River. Civil engineers erected a dam that formed the world’s then-largest man-made lake.

4) Today the Canal operates much as it did in 1914. In each transit, 52 million gallons of fresh water is lost, but it is quickly replaced by Panama’s heavy rainfall. The canal remains a marvelous wonder constructed with the combined skills of structural, geotechnical, hydraulic and sanitary engineers.

1) One of the world’s tallest free-standing having height 1,815 ft.

2) It was erected at an amazing rate of 18 ft. per day. During construction, concrete flowed from the bottom of the tower as it ascended, while aircraft-type bombsights kept the tower plumb as it went up.

3) The CN Tower can withstand 260-mph gusts.

4) The Sky Pod, a seven-story structure 1,100 ft. high, was built around the base of the tower and jacked into place as one unit. A pair of 10-ton counterweights is attached to the mast to keep the tower from swaying too much.

5) A Sikorsky helicopter hoisted the crowning antenna, for which the tower was originally erected. FM radio signals are broadcast from the base of the antenna, while television signals are sent from the top. Presently, 16 of Toronto’s media signals are transmitted from the tower.

Click here to check out the pictures of other skyscrapers

1) The Channel Tunnel linked the Britain and the rest of Europe

2) Three concrete tubes each 5 ft. thick, plunge into the earth at Coquelles, France and make passage through the English Channel.

3) The passengers can board the two trains running at a speed greater than 100mph through these tubes.

4) Passengers board not on foot, but in automobiles and buses.

5) The third tube is used basically for maintenance and emergency vehicles.

6) It is one of the intelligent structures built with immense precision. Huge pistons open and close ducts, relieving the pressure that builds ahead of the train’s noses. Some 300miles of cold water piping run alongside the rail tracks to drain off the heat raised by air friction.