Billed as the most luxurious ship ever built, the newest addition to the Regent Seven Seas Cruises fleet, Seven Seas Explorer, is also one of the most expensive, with a price tag of $450 million and a suite that costs $10,000 per night. The extravagant interiors of the 750-passenger ship are currently being readied for a big debut by three firms: ICRAVE, RTKL, and Tillberg Design.