N4. Porto Cervo, Sardinia, Italy: $3,100 per night
Built in 1959 by architects and landscape designers Jacques Couelle, Luigi Vietti and Michele Busiri Vici, the place was established by Prince Karim Aga Khan as a private retreat for his rich family and friends.
According to some European luxury estate brokerage, Porto Cervo is the most expensive location in Europe, with house prices as high as 300 euros per square meter.
Today, Porto Cervo is composed of high-end boutiques and restaurants, as well as the famous Billionaire nightclub.
At the marina you can spot some of the largest super yachts in the world anchored at Porto Cevro.
