In Monaco, there’s a new record-holder in play. The city is opening its first skyscraper in 30 years, so of course they had to go big. When completed, the Odeon Tower will be 170 meters tall and will include the world’s most expensive apartment, the “Sky Penthouse” with the record-breaking price tag of $400 million.With stunning views, the penthouse includes 38,000 square feet of living space spread across five levels, with a kitchen on every level — and a water slide extending from a dance floor to the private infinity pool on the terrace. The opulent destination will also come with a private chauffeur, a caterer, three staff bedrooms, a 24-hour concierge service and access to a health club.