The Washington Monument is the world's tallest obelisk, this architectural wonder stands 555 feet. The construction began in 1848 but was interrupted several times by the American Civil War. According to the National Park Service (NPS) US, the structure evokes the timelessness of ancient civilisations and embodies the "awe, respect, and gratitude" of the nation for its Founding Fathers. 

Alien Sightings 

Did you know? In 1952, sightings of unidentified flying objects (UFOs) buzzed the White House. The series of unidentified flying object sightings were reported from 12 July to 29 July. According to a report, a dozen UFOs outran a team of U.S. Air Force fighter jets flying Washington D.C.

The event caused a national security alarm.  In 2007, Senate Majority Leader Harry Reid proposed that the Pentagon investigate the matter. “Everyone told me this would cause me nothing but trouble,” said Reid. “But I wasn’t afraid of it. And I guess time has proven me right.”

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The Biltmore mansion is known as America's largest home to date. It boasts 250 rooms and the square footage of four football fields. Designed by George Vanderbilt together with architect Richard Morris Hunt and landscape architect Frederick Law Olmsted, the staggering 8,000-acre estate has a winter garden and a banquet hall with a seven-story high ceiling and triple fireplace.

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One of New York's prized possessions is the Empire State Building, a 120-story Art Deco skyscraper in Midtown Manhattan. Erected in the 1920s by architects Shreve, Lamb & Harmon Associates, the building is a mobbed tourist destination. 

It was estimated that the Empire State attracts more or less four million visits annually. At night, it is capable of displaying up to 16 million colours through its state-of-the-art LED light system.

Did you know? There is a widely heated debate whether a falling coin from the Empire State could severely harm and even kill a human being. Apparently, the myth is simply not true. A penny, with a terminal velocity of 25 miles per hour, could not gather enough velocity from the top of the Empire State Building to do any real damage. Authors of a New York Post article described that "the coin would [just] bounce off with little more than a light sting."

If you ever find yourself in Missouri, consider dropping by the infamous Gateway Arch, a 630-foot monument made of stainless steel. The clad is considered to be the world's tallest man-made arch. 

Designed by Eero Saarinen in 1947, the arch commemorates the Western expansion in America. “The arch symbolized the gateway to the West, the national expansion, and whatnot," said Saarinen. 

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The Romanesque, rough-stone Trinity Church in Boston is one of the city's most well-known landmarks. With its heavy walls, rounded arches, and massive towers, the structure heralded a muscular and bold new style. Inside visitors are greeted by an innovative and open-format layout comprised of stunning murals and stained glass windows.

During Christmas season, the church welcomes tourists and locals who line up for its free candlelight carols and performances of the Trinity choirs who have been around since 1909.

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South Dakota's granite Mount Rushmore is arguably America's most visited mountain. It features the carved faces of four American Presidents who each made history in their respective terms. Former US Presidents George Washington, Thomas Jefferson, Abraham Lincoln and Theodore Roosevelt have gazed out from the peak since 1941.

It is estimated that the mountain receives three million visitors every year.