Hawaii: Anahulu Stream Bridge - Affectionately known as the "Rainbow Bridge" for its double arch, this concrete feat straddles the Anahulu Stream in Haleiwa. The current structure has been here since 1921, replacing the wooden pile that stood before it. Have you ever visited this bridge?

Idaho: Perrine Bridge - This simple but attractive truss bridge stretches over the Snake River, close to Twin Falls. It's almost 1,500-feet (457m) long and bookended by rugged canyon. The rust-red structure is impressive whichever way you look at it. Have you ever visited this bridge?

Illinois: DuSable Bridge - Spanning the Chicago River in the heart of the Windy City, this striking structure is also known as the Michigan Avenue Bridge, as it extends this boulevard across the water. But, since 2010, the official name of this structure has been the DuSable Bridge, after Jean Baptiste Point du Sable, thought to be Chicago's first permanent resident. Nestled among some of the city's tallest skyscrapers, it also opens up gracefully if large boats need to pass beneath it. Have you ever visited this bridge?

Indiana: Cataract Falls Covered Bridge - The state of Indiana has oodles of covered bridges but this is the most famous and beautiful. Built in 1876, the bridge is in Lieber State Recreation Area. The structure is named after the Cataract Falls, two terraced waterfalls that together make up the largest in the state. Have you ever visited this bridge?

Iowa: Kate Shelley High Bridge - Legend has it Kate Shelley saved a trainload of people from plummeting to their deaths after a storm destroyed a section of railroad near Honey Creek. She risked her life by crawling along the remaining train trestle to the closest depot, sounding the alarm and halting a passenger train she knew to be approaching. The heroine arrived in time and succeeded in stopping it in its tracks. This bridge was completed some 20 years later in 1901, and was named after Shelley to commemorate her actions. Have you ever visited this bridge?