A heavily altered Boeing 747-8, Air Force One, was created to specifically fulfill the demands of the President and his crew.
It features a secure communications system, a medical facility, a meeting room, and personalized décor.
The U.S. Air Force operates the aircraft, which is kept in top condition in terms of security and safety.
5. $506 million for Villa Leopolda
With a complicated past, this home on the French Riviera served as a hospital during World War II. Constructed in 1902 for Belgian King Leopold II, Villa Leopolda is currently the second most expensive private property globally, with a sale price of $506 million.