U.S. President Barack Obama greeted staff from the newly reopened American embassy in Havana on Sunday, hailing an "historic opportunity" with Cuba.

U.S. President Barack Obama, together with First Lady Michelle Obama and their children, walked through the streets of Old Havana Sunday as part of a historic three-day trip to Cuba.

Watch pictures & videos of President Obama’s Cuba visit here

Built from 1939 to 1942, the two-story building is more than half the size of the White House, according to U.S. State Department data, and was constructed with the finest materials and craftsmanship of the time.

Follow the minute-by-minute special coverage of President Obama’s Cuba visit

U.S. President Barack Obama, accompanied by his family, has just arrived in Havana, Cuba, marking the first visit ever by a sitting American since Calvin Coolidge in 1928.

Follow the minute-by-minute special coverage of President Obama’s Cuba visit

It’s not just Cubans who are anxiously anticipating U.S. President Barack Obama’s arrival this afternoon. American travelers in Havana, some of whom booked their trips long before the trip was announced, are tickled to be in town during the historic visit.

Watch pictures & videos of President Obama’s Cuba visit here

Almost exactly on year ago, Airbnb received permission to begin operating in Cuba, but was only able to connect U.S. guests with accommodations.