Originally completed in 1931, the Empire State Building (which takes its name from the nickname of New York State) was for a long time the world's tallest building. It was surpassed in 1972 by the World Trade Center, and later by a number of other buildings around the world. As of 2001, with the destruction of the World Trade Center in the 9/11 terrorist attacks, the Empire State once again became the tallest building in New York City. It has 102 stories and stands at 1,250 feet (1,454 if you include the antenna spire.)
The canal is a 51 mile man-made waterway connecting the Pacific Ocean to the Caribbean Sea, and the Atlantic Ocean, cutting through the Isthmus of Panama. Since its completion in 1914, it has been an important route for international trade, as it eliminated the need for ships to sail around Cape Horn below South America to travel between the two oceans. Construction of the Canal took over 30 years and remains one of the most complex and significant engineering projects ever attempted.
Arguably the most famous and iconic bridge in the world, the Golden Gate crosses the opening of the San Francisco Bay, where it meets the Pacific Ocean, as part of both US Route 101 and California State Route 1 (also known as the Pacific Coast Highway.) The bridge has become a famous and enduring symbol of the city of San Francisco, and of the state of California more generally. Construction on the suspension bridge began in 1993 and was completed in 1937 at a cost of over $35 million. When it was completed, the Golden Gade Bridge had the world's tallest suspension towers - at 692 feet - but has since been surpassed by bridges in both Japan and Denmark.