Top 10 most expensive buildings in the world, some costing up to $25 billion.

Many factors influence the cost of these projects, from planning and design to materials, location, and even unexpected delays, all of which can contribute to the overall investment.

Over the past few decades, numerous buildings have exceeded $1 billion in total investment costs. Below are the 10 most expensive buildings, according to Business Insider .

Wynn Resort, Las Vegas: $2.7 billion in 2005

This curved architectural masterpiece boasts over 2,700 rooms, more than 1,800 slot machines... Interior designer Roger Thomas has created a surreal atmosphere with vibrant patterned carpets, hanging umbrellas, and Wynn's patented fragrances that permeate the entire building...

One World Trade Center, New York: $3.8 billion in 2014

PHOTO: REUTERS

The reconstruction of the World Trade Center complex is a controversial project, with debate over how to replace the two twin towers destroyed in the September 11 terrorist attacks. Its iconic height of approximately 452 meters makes it the tallest skyscraper in the United States.

Parliament building, Bucharest, Romania: $4.3 billion in 1997

Workers demolished about a fifth of the city, displacing 40,000 residents, to create a colossal palace and its sprawling, winding avenue, deliberately designed to be larger than France's Champs-Élysées. Over 700 architects were involved in its design, and 20,000 workers toiled day and night to complete the project. The interior features tons of marble, crystal, and gold-plated ceilings.

Emirates Palace Hotel, Abu Dhabi, UAE: $3 billion in 2005

The hotel is vast but has only 394 rooms, including several suites. Domes stretch across the roof, and guests can enjoy a private beach. The ceilings are elaborately decorated and covered in gold leaf, requiring replacement every few years. They are also adorned with sparkling Swarovski crystal chandeliers.

Cosmopolitan Hotel, Las Vegas: $3.9 billion in 2010

PHOTO: Steve Marcus/Reuters

Comprising two 50-story towers, Cosmopolitan markets itself as a luxury destination, hoping to differentiate itself from the vibrant and flashy competitors on the Las Vegas Strip.

Apple Park, Cupertino, California: $5 billion in 2017

A spaceship. A glass donut. However you describe it, Apple's Cupertino headquarters building is truly unique. In 2013, Bloomberg Businessweek reported that construction costs had skyrocketed from $3 billion to $5 billion. Transforming it into a "net-zero energy" structure with miles of curved glass contributed to the high price. The circular building accommodates 12,000 people across four floors.

PHOTO: REUTERS

SoFi Stadium, Inglewood, California: $5 billion in 2020

The stadium has a curved roof, partly transparent, but the open sides allow for air circulation. One of the stadium's standout features is its double-sided video screen. There is also space for cultural events. The venue also serves as a performing arts space with a capacity of 6,000 people.

Marina Bay Sands, Singapore: $5.5 billion in 2010

You could spend an entire weekend at Singapore's Marina Bay Sands and still not see everything. A museum, 270 shops and restaurants, a convention center, an ice rink, a luxury hotel, and a casino are all packed into three towers, each 55 stories high. Skywalks connect the towers at a height of approximately 192 meters. On the 57th floor, there's a massive 130-meter-long infinity pool offering breathtaking views...

Araj Al Bait, Mecca, Saudi Arabia: $15 billion in 2012

According to Sotheby's, the Saudi Arabian government built the Abraj Al Bait complex to accommodate the millions of Muslim pilgrims who travel to Mecca each year. It's difficult to determine the exact cost of each individual building, but the seven skyscrapers (the tallest reaching 452m) are estimated to cost $15 billion in total.

Hudson Yards, New York: $25 billion in 2020

PHOTO: REUTERS

The Hudson Yards complex, encompassing residential, commercial, and retail space in West Manhattan, is a massive project that raised $5 billion for the 30 Hudson Yards buildings alone in 2015. Sixteen buildings are concentrated in the area, providing space for 4,000 apartments and 55,000 workers...

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