The Manchac Swamp Bridge is a twin concrete trestle bridge in the US state of Louisiana. It is located around Lake Pontchartrain, a lake well known for its incredibly long bridges, as you will see in a moment. Although the bridge is totally safe to drive on, Louisiana legend says that the bridge is haunted by a Cajun werewolf known as a “Rougarou” and a voodoo princess. However, despite these spooky tales, the only thing that drivers should be cautious of is not to get too close to the alligators that make a home on the waters under the bridge.