In which state does the Royal Gorge Bridge, one of the highest bridges in the US, span a canyon?

Which Boston megaproject buried a central freeway in tunnels beneath the city?

The Astrodome, the world's first domed multipurpose stadium, opened in 1965 in which city?

Which San Antonio landmark, originally a Spanish mission, became a symbol of Texas independence?

The Grand Coulee and Bonneville dams generate hydroelectric power on which river?

In which state does the Pentagon, headquarters of the US Department of Defense, sit just across the river from Washington, DC?

The Confederation Bridge, one of the longest bridges over ice-covered water, connects Prince Edward Island to which Canadian province?

In which Texas city is Reunion Tower, topped by a glowing sphere, a landmark?

In which city does the Torre Latinoamericana, an early skyscraper famous for surviving major earthquakes, stand?

Pittsburgh has more than 400 of which type of structure, earning it a famous nickname?