The biggest ranch in America that stretches over 510,000 continuous acres - that's 796 square miles, (2060 square kilometers) making it a plot of land bigger than the island of Oahu - has gone on sale for US$ 725 million. Realtors are hoping the Waggoner ranch in north Texas will become the most expensive estate in the world - after slapping the huge price tag on it in the hopes of attracting a Silicon Valley entrepreneur or oil tycoon. Cattle baron Dan Waggoner established the estate in 1849 - and it has operated with its backwards 'D' logo ever since. The estate includes the 2060 square kilometers ranch spread over six North Texas counties, with two main compounds, hundreds of homes, about 20 cowboy camps, hundreds of quarter-horses, thousands of heads of cattle, and 30,000 acres of cultivated land, according to Dallas-based broker Bernie Uechtritz, who is handling the sale along with broker Sam Middleton of Lubbock. Oil was discovered on the property in 1902 and there are now more than a thousand wells spread across the property.

One of Britain's top entrepreneurs has unveiled a new plan to build London's most expensive block of flats in Mayfair. "Audley Square House" is being billed as Britain's first US$ 3 billion apartment block. The previous records belonged to private projects One Hide Park and 199 Knightsbridge, which construction costs were US$ 2.2 billion. According to British publication Daily Mail John Caudwell, the founder of Phones4U, bought the five-story Audley Street garage in Mayfair, central London for US$ 230 million in order to knock it down and build a high-end housing complex. At first the site has consent for a nearly US$ 450 million scheme by Foster & Partners but John Caudwell has since added an extra building to the plot. After ditching the Foster's scheme he interviewed 30 "leading architects from around the world" before appointing New York-based Stern for its "ability to design high-quality buildings that do not stand apart from their surroundings but rather fit in comfortably amongst their neighbors". The 18,500 square meters scheme, known as "Audley Square House", will be 9 stories above ground, capped by large penthouses and duplexes, plus 5 underground - including 2 levels of car parking, plant and a leisure center. Each townhouse and penthouse will have its own gym and swimming pool, while the penthouses will have dedicated lifts to ensure their owners' privacy. The development's communal facilities will include a 15-meter swimming pool, a business center for holding meetings, a gym, spa and cinema and games room. At the first of April plans for the ambitious complex were submitted to Westminster Council. But as mentioned Becky Fatemi, director of Rokstone estate agents during her interview to Daily Mail, powerful locals might not be happy with the years of building works which would be likely to ensue in the area. The neighbors are powerful and include the Embassy of Qatar, the Dorchester Hotel and very wealthy apartment owners who will expect the site construction to be managed to the highest levels to ensure no noise or construction impact and they will expect constantly clean roads.

Russia has announced big plans for a superhighway that would effectively connect all the continents in the Northern Hemisphere, making it possible to travel from New York westward through Russia and on to London without the need for an airplane or a boat. The exact route hasn't been determined yet, but what is clear is that a plan such as this would create the largest, longest superhighway on Earth. The idea, dubbed the Trans-Eurasian Belt Development (TERP), would see a high speed railway and motorway built from Eastern Europe, across Siberia and over the Bering Strait to Alaska. At a meeting of the Russian Academy of Science, the head of the Russian Railways Vladimir Yakunin presented the idea for the Trans-Eurasian belt Development (TEPR). Mr Yakunin has been engaged in the development of the project with academic Gennady Osipov and the rector of Moscow State University, Viktor Sadovnichy. During the meeting Vladimir Yakunin told that the project could link existing networks and supercharge global economic growth. The project would see not only a new train network built alongside the Trans-Siberian Railway but the construction of major roads, pipelines for oil and gas, and the laying of facilities for electricity and water supplies. "This is an inter-state, inter-civilization, project. It should be an alternative to the current model, which has caused a systemic crisis. The project should be turned into a world "future zone", and it must be based on leading, not catching, technologies," he said, according to the Siberian Times newspaper. If the idea is successful, it is expected that could create 10 to 15 new industries, new cities and a huge number of new jobs, as well as further development of Siberia and the Far East. Talking about a rough estimate for the costs of the project he said that it will require trillions of dollars, but insisted the economic returns would outweigh these investments. Today not all countries can provide high-speed railway network needed for this project. In Eastern Europe the European Union is separately drawing up plans for a high speed rail corridor to connect the Baltic States to Western Europe's high speed rail network - which runs through the Channel Tunnel to London. North American passenger railways are comparative undeveloped, however. Plans drawn up by President Obama to develop high speed rail corridors across the United States have stalled amid opposition. Bridges and tunnels spanning the Bering Strait have been proposed since the late 19th century but none has ever been built. The Russian government has expressed public support for a number of proposals in recent years but ground has not been broken on any of them, reported The Independent. China and Russia also unveiled a separate plan last year to connect, as well as a plan for a continent-spanning rail network that could cross the Bering Strait .

A whopping Italian estate with a 12th-century medieval castle and a sprinkling of Tuscan farmhouses in the ground, is on market for US$ 29,3 million. According to The Telegraph, 14,3 thousand square meters mansion has 115 bedrooms, 100 bathrooms on the side. This castle just east of Siena, wrapped in 630 hectares planted with 1,500 olive trees producing award-winning olive oil, is thought to be the largest property in the world currently on the market. The setting in Tuscany, the medieval courtyard with tower and chapel, the Italianate gardens with palms and box hedges, the interiors with marble floors and elaborate painted ceilings, make it so romantic that it is sometimes hired for weddings. It goes without saying that there is plenty of room for guests to sleep, as well as pools for them to swim in. "It is exceptionally beautiful. There are many castles in Tuscany but very few are medieval," says the agent John Jonk of Sotheby's International "The approach to it is wonderful and you go into another world. There are thousands of wild boar and roe deer, magical woods, vineyards, olive groves and grain fields. On the estate it is always silent. The castle was built at a time just before Giotto, when the Renaissance lay around the corner and Siena was at war with Florence." From the 1400s it had been in the hands of the Piccolomini family until the current owners bought it more than 30 years ago. "The price is unusually low considering it provides 14,3 thousand square meters of accommodation. But this reflects the market in Europe at the moment." It is believed that Galileo Galilei stayed in the tower and must have gazed out upon the same night sky. How does it compare to other global Godzillas of the property world? One of the largest newly built palaces is the 27-storey skyscraper Antilia in Mumbai, India, which provides 37,1 thousand square meters of space, including six stories of parking lots, a lobby with nine elevators and several lounges, a ballroom with crystal chandeliers, swimming pool, bar, yoga studio, ice room, four-storey garden and private sleeping areas for a family of five. It is thought to have cost nearly US$ 2 billion to build and is the home of Mukesh Ambani, head of the India-based petrochemical Reliance Industries. According to therichest.com, the largest home is the Istana Nurul Iman Palace, at 200 thousand square meters. This is the official residence of the Sultan of Brunei and has 1,788 rooms, 257 bathrooms, five swimming pools, a 110-car garage, air-conditioned stable for 200 polo ponies, banquet hall, and a mosque large enough for 1,500 worshippers. Its estimated cost was US$ 2,08 billion.

At first 15 floors in 6 days, then 30 floors in 15 days, now 57 floors in 19 days... Chinese company "Broad Sustainable Building" again hits a record. BSB Architect Xian Min Zhang has released a time-lapse video of the construction of the company's latest building: a 57-floor, 80 thousand square meters skyscraper, fully built with energy-efficient, factory-produced, Lego-like blocks. He claims BSB is now building its prefabricated skyscrapers at a record three floors per day. The new prefabricated tower, which named "J57", has 19 atriums of 10 meters' height each, 800 apartments and office space for 4,000 people. The use of company's modular construction technique, which won a CTBUH Innovation Award in 2013, reduced the use of concrete by 15,000 trucks, which has nearly eliminated all the dust that would normally be released during conventional construction, an important advantage in pollution-ridden China. Besides this, the air inside the building is 99.9 percent pure, thanks to the tight construction and built-in air conditioning system. The J57 building has quadruple-pane glass and is so energy efficient that it will save more than 10,000 metric tons of CO2 emission compared to a conventionally constructed building of the same size and use. The first attempt to build such buildings company made in 2010, when built its first prefabricated tower. The 15-story Ark Hotel was built in record 6 days . After two years, company built 30-story prefabricated hotel just in 15 days. Then in 2013 the founder of parent company Broad Group Chairman Zhang Yue announced about its ambitious project. The company planned to build world's tallest tower - 838 meter high "Sky City". According to the company, construction of this tower began on June 20, 2013 and would be completed by April 2014. But the project has been halted, apparently for political reasons. This Mini Sky city, while proving that Zhang's techniques work-and quite impressively so-was itself halted at 20 stories and then cut in height from 97 stories to 57; the company states that this was due to its location near an airport.