5 Most Expensive Cities to Visit in the US

3. Key West, Florida

Average Basic Cost Per Person Per Day: $451

Key West is an island city with a population of around 26,527 people. The city is known for its underwater activities like snorkeling and diving, and is home to beautiful beaches. Tourists flock to the city due to its conch-style architecture and historical sites. Some of the tourist attractions in the city include Mallory Square, Ernest Hemmingway Home and Museum, and Truman Little White House.