(CNN) — There’s been a trend in recent years for billionaire basements – subterranean extensions to the homes of the rich and famous, where they can bunker down and live large. Now an Austrian company ...

Editor’s Note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter. Get the latest news in aviation, food and drink, where to stay and other travel developments. There’s been a trend in ...

Austria's Migaloo is offering to build a private "submersible superyacht" for the ultrarich. It says the M5 would be able to travel 820 feet underwater and stay submerged for a month. Despite the high ...