Regent is the pinnacle when it comes to luxury cruises. The brand appeals to well-traveled, discerning cruisers who appreciate stellar service and an all-inclusive onboard experience. Want the ultimate in decadence? Try the Regent Suite — the most expensive stateroom at sea — available on the line’s newest vessels. The accommodations feature sweeping views through floor-to-ceiling windows, a Steinway grand piano and an impressive art collection in nearly 4,500 square feet of space. For a stay there, expect to pay from $11,000 per night.