Built over the course of only 17 days during the spring of 1943, Tham Krasae Bridge is the longest railway bridge in Thailand and one of the most famous; the railway bridge is part of the infamous Death Railway. During World War II, Japanese occupiers used prisoners of war as laborers to built a rail line from Myanmar to Thailand to help keep their troops supplied. Working conditions were horrific, and more than 12,000 Allied POWs lost their lives working on it.

Today, trains traveling along the railway stop at Tham Krasae, where passengers can jump off and photograph the trestle bridge as it crosses the Khwae Noi River. The nearby Krasae Cave was believed to have served as a campground and field hospital for Japanese soldiers.