The developers of the World Trade Center reached a milestone Monday, completing construction on one of the four towers going up there -- the first since the 9/11 attacks, NBC New York reported.
A steel beam was hoisted on top of the 72-story 4 World Trade Center -- the shortest of them all, standing at 977 feet tall -- marking the end of structural construction. The inside of the building is still being worked on.
World's Tallest Buildings
World Trade Center Tower Completes Construction
Height: 1,449 ft. Floors: 100 Location: Shenzhen, China Year Built: 2011
Height: 1,451 ft. Floors: 108 Location: Chicago, Ill. Year Built: 1973
Formerly known as Sears Tower, it was the tallest building in the world from 1973 to 1998.
Height: 1,480 ft. Floors: 66 Location: Nanjing, China Year Built: 2010
Height: 1,483 ft. Floors: 88 Location: Kuala Lumpur, Malaysia Year Built: 1998
The Petronas Towers were the largest buildings in the world from 1998 to 2004. They are still the world's tallest twin buildings.
Height: 1,588 ft. Floors: 118 Location: West Kowloon, Hong Kong Year Built: 2010
Height: 1,614 ft. Floors: 101 Location: Shanghai, China Year Built: 2008
Currently the tallest building in Mainland China. The Shanghai World Financial Center will be exceeded in height by the adjacent Shanghai Tower, which is under construction and due for completion in 2014.
Height: 1,667 ft. Floors: 101 Location: Taipei, Taiwan Year Built: 2004
Taipei 101 was the tallest building in the world from 2004 to 2010. It became the tallest and largest green building in the world when it was awarded LEED Platinum certification in 2011.
Height: 1,972 ft. Floors: 120 Location: Mecca, Saudi Arabia Year Built: 2012
Though not the tallest building, The Abraj Al-Bait Towers, also known as the Mecca Royal Hotel Clock Tower, holds a slew of other records. It is the world's tallest hotel, the tallest clock tower, it has the world's largest clock face, and is the building with the largest floor area (3.3 million sq ft.)
Height: 2,717 ft. Floors: 163 Location: Dubai, UAE Year Built: 2010
Burj Khalifa (formerly known as Burj Dubai) is not only the tallest skyscraper, but also holds the title to the world's tallest manmade structure. Thankfully for those traveling to the upper floors, the building is also home to the world's fastest elevators, which can zip up and down the building at 40 mph.
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4 WTC is dwarfed by the site's anchor building, 1 World Trade Center, which will eventually tower 1,776 feet tall. Maki and Associates, the architects behind 4 WTC, told The New York Times that the building was intentionally designed to be understated.
The newly completed building is New York City's sixth-largest skyscraper. It is scheduled to open in 2013, and about half of the building has already been leased to the Port Authority.
The 14 contestants on ABC's soon-to-debut reality show "The Glass House" (which, uh, may or may not be premiering June 18 -- check your local listings) will be staying in a home made entirely of glass. But they likely won't have the creature comforts of these actual glass beauties. From sweeping windowed walls that look onto extravagant ocean views to super-modern glass staircases and glass-enclosed dining rooms, these homes are sure to outshine the contestants' temporary digs.
Location: Crystal Bay, Nev.
Price: $43 million
Sq. ft.: 8,694
This stunning glass and steel home perched above the shores of Lake Tahoe, and anchored in granite, is an unmatched architectural gem. It's also a behemoth, at nearly 9,000 square feet.
With glass walls extending nearly the length of the whole house, you'll feel like you're walking outside instead of indoors. The great room has panoramic views from all angles. Other features include a breakfast nook in the kitchen, a glass wall in the master bathroom and wraparound decks.
Massive walls of glass make everything open in this home. Sitting on 13.5 acres, it's so large we don't even know the square footage! There are long open galleries leading from one end of the house to the other and a large pool. Take a dip!
Location: Indian Wells, Calif.
Price: $12 million
Sq. ft.: 18,404
The design of this home is timeless: The living and dining areas "float" between two large sunrooms, with glass walls that open up to the vast outdoor areas. And you'll get some of the most gorgeous canyon and mountain views money can buy.
Location: Los Angeles
Price: $5.45 million
Sq. ft.: 3,538
Glass panels line the walls of this luxe L.A. mansion, where you can get a different, amazing view from almost every room. Look out onto the serene raised pool that spills over like a waterfall; walk further and take in a wide view of an interior courtyard with sky roof.
Location: New Canaan, Conn.
Price: $2.795 million
Sq. ft.: 1,773
A giant glass entry way adds elegance to this three-bedroom, three-bathroom home situated on 2.2 acres in Connecticut. It's the perfect place to look out onto the beautifully manicured lawns surrounding the house, a "true masterpiece" built in the 1950s with high ceilings, original period fixtures and original cabinetry.
From inside the entry of the home, you get a grand view of the surrounding greenery outside. Of course, if you're not satisfied with the main residence, there's a guest cottage on the property. Everyone needs a vacation from home.
You'll be bathed in sunlight in the living room, which has floor-to-ceiling windows. By the way, there is an approved building site on the lot in case you want to expand -- just make sure to keep the original home intact.
Price: $1.85 million
Sq. ft.: 5,429
With a glass wall overlooking terraces and a pool (and, best of all, a floating staircase!), this inspired glass house was dreamed up by award-winning architects and celebrity designer Marina Floccari. It's even been a favorite for photo shoots by publications such as Veranda and Jezebel!
Soaring ceilings reaching 25 feet high give the massive living quarters an airy feel and, as seen above, the glass wall overlooking the pool opens it up even more. It's accurately described as "an entertainer's dream inside and out!"
This extravagant home is four stories tall with views of the Gulf of Mexico from each. Designed with openness in mind, the great room has 22-foot ceilings with ample windows. Each level is connected by a custom staircase and a glass elevator, which goes all the way up to the rooftop observation deck.
The master suite on the fourth floor includes an infinity pool and spa that overlooks nearby Lido Beach. The home also boasts state-of-the-art green features, including energy conserving electronics and rooftop solar panels.
Price: $3.9 million
Sq. ft.: 5,000
Private outdoor pools are the name of the game when it comes to penthouses. This Philadelphia pad offers floor-to-ceiling windows with unobstructed 270-degree views. It also has access to the upper-level outdoor terrace, which features a fully equipped kitchen, elegant lounging areas -- and that pool we were talking about.
Price: $1.289 million
Sq. Ft.: 2,560
With access to a 44th floor private pool, it is no wonder the Realtor describes this Miami penthouse as “sexy.” It has 20-foot ceilings with walls of glass that let in plenty of sunlight and offer ”jaw-dropping” views.
White flooring runs throughout to add to the sexiness. It also features top-of-the-line fixtures and appliances. The building offers an exercise room, a health spa and another swimming pool if you want to take a dip on a lower level.
Location: Laguna Beach, Calif.
Price: $3.5 million
Sq. ft.: 4,196
It's hard to tell from the front, but this home has expansive, unobstructed ocean views from floor-to-ceiling windows lining the back side of the house. Strolling from the kitchen to the living room to the bedroom, you'll never miss a gorgeous view. Plus, there's a sliding wall of glass that leads to an outdoor space with heated patios!