Tropical Storm Harvey turned into one of the heaviest downpours in U.S. history, overwhelming Houston and leaving the fourth-largest American city submerged.

Photos being shared on social media are bringing to light the extent of the devastation. The below interactive slider shows what the city of 2.3 million looked like before Harvey, and what it looks like now.

The Travis Street Bridge over the Buffalo Bayou River, near the University of Houston.

Buffalo Bayou Park is a 124-acre green space, with views of Houston's skyline and a slow-moving river that flows thorough the city.

Texas Memorial Parkway

Floodwaters from Tropical Storm Harvey flow in the Buffalo Bayou in downtown Houston on Aug. 28, 2017.


Harvey devastation from above: Before and after video using drone footage