World's Most-Visited Tourist Attractions
Alex Segre / Alamy
No. 4 (tie) Union Station, Washington, D.C.
Annual Visitors: 40,000,000
Opened in 1907, this busy station shuttles some 12,500 passengers daily in and out of the city. But it also handles millions of tourists who pass through to take in the impeccably mixed architectural styles throughout the colossal building: from Classical to Beaux-Arts to Baroque. More than 70 retail outlets make Union Station a shopping destination, and it’s also a jumping-off point for many D.C. tours.
Source: Union Station