Ever been to the Louvre, the Smithsonian or the Met? Take this quiz to test your knowledge of these and other famous museums.
The Playboy Mansion was listed at $200 million in the spring of 2016, with the condition that the buyer must allow Hugh Hefner to live there until his death.
Hefner spent just $1 million on the 20,000 square foot (2,000 square meters) mansion in 1970, the highest price ever paid for an Los Angeles mansion at that time.
The Nationwide Building Society estimated the palace at $1.56 billion in 2012. It was valued at just $17 million in 1953 when Queen Elizabeth took the throne.
The property at 1600 Pennsylvania Ave. NW has an estimated value of $320 million on the open market. Not a bad deal for one of the world's most iconic mansions.
The White House features 132 rooms, including 35 bathrooms, within its 55,000 square feet (5,000 square meters).
Built by publishing magnate William Randolph Hearst, Hearst Castle is in San Simeon, California.
Hearst Castle has 27 bedrooms, two spectacular pools and a $191 million price tag.
The world's first billion-dollar residence is located in Mumbai, India, and was completed in 2011. It's known as "Antilia."
The spectacular Antilia stretches 27 stories over Mumbai, measuring 568 feet (173 meters) tall.
Once known as Spelling Manor, the home is now referred to simply as The Manor after it was purchased by Formula One heiress Petra Ecclestone in 2011.
The Manor measures 57,000 square feet, including a 7,000 square foot master suite, and cost around $45 million to build back in the '80s.
Oprah spent $50 million for her Montecito, California, estate in 2001, which she named "The Promised Land."
Homes at One Hyde Park go for $12,000 per square foot in a city where prime real estate averages $2,900 per square foot.
Prokhorov put down a 10 percent deposit of $53 million on the property in 2008. He later lost the entire deposit amount after deciding not to buy the home.
Hala Ranch, which is in Aspen, Colorado, sold for $49 million in 2012.
The home measures a staggering 56,000 square feet, including 15 bedrooms and 16 bathrooms. Hey, you need to have a spare bathroom for guests, right?
Maison de L'Amitie includes 60,000 square feet (6,000 square meters) of living space in Palm Beach, Florida, and was once owned by Donald Trump.
Trump's family lives in a three-story apartment that measures 30,000 square feet (3,000 square meters) and is valued at $50 million in New York City.
Trump paid just $10 million for the Palm Beach, Florida, estate in 1985, and it's worth millions more today.
The massive Mar-a-Lago has 60 bedrooms, 30 bathrooms and three bomb shelters spread over 17 acres (7 hectares).
Railroad tycoon Henry Flagler built the 100,000-square foot (9,000-square meter) Whitehall as a present for his wife in 1902.
The 75-room Whitehall served as a hotel until the 1950s but now serves as a museum that attracts over 100,000 visitors each year.
Siegel and family started their massive home in 2006, with a scheduled completion date of May 2017.
The 90,000-square foot Versailles has 21 bedrooms, six pools and a 30-car garage.
The family spent $50 million on the home near Orlando, Florida, but offered to sell it for $100 million during a 2016 interview.
Bill Gates spent $121 million on the 66,000-square foot (6,000-square meter) Xanadu 2.0.
George Vanderbilt's family home, the Biltmore, opened in 1895 in Asheville, North Carolina.
The Biltmore has 250 rooms, including 35 bedrooms, 43 bathrooms and 65 fireplaces to keep everyone warm in all that space.
Ira Rennert's Fairfield Pond, worth an estimated $249 million, is located in the Hamptons in New York.
Beverly House, which was listed in 2014 at $135 million, features 50,000 square feet of living space.