A Palm Beach compound listed for an eye-watering $88 million comes with the ultimate beachfront amenity—and it’s not a pool, cabana, or even a helipad. The estate has its own underground tunnel ...

A banner reading "And Porsche said let there be a hole" is displayed on the Kapuzinerberg in Salzburg, where activists stage a protest against the planned construction of a private access tunnel. The ...

More than 19,000 Salzburg residents are furious at the private tunnel plan a billionaire proposed to the city of Salzburg, The Times reported. The tunnel would allow Wolfgang Porsche to access his ...

Plans by a billionaire heir of luxury sports car maker Porsche to build a private tunnel and underground garage beneath his mansion on one of Salzburg's most iconic hills have sparked outrage in the ...

A private tunnel, a “wellness wing” and 137 feet of beach characterize an ultraluxury listing in Winnetka. The massive North Shore estate hit the market last week asking $29.9 million, the ...