The dunes of City West, a ghost town on the Lake Michigan coast, offer windswept beauty, while America's longest navigable underground river flows beneath southern Indiana's limestone terrain.

Brazilian scientists say they have found signs of a huge underground river flowing far beneath the ... to the extreme north of Brazil and is catalogued the longest in the world with 6.800 kilometers.

The archaeological excavation, which began in late January 2025, focused on the cave's entrance area, where researchers explored sections along Italy's only navigable underground river.