Peace Museum at the Remagen Bridge

A former railway bridge built for military reasons during World War I. The bridge was badly damaged during World War II and plans to rebuild it never materialized. Both towers remain as a memory and are listed monuments. In the Remagen Bridge Peace Museum, visitors learn about the POW camp. Events are also regularly held there.

You can find more information and opening times here: bruecke-remagen.de.

The Ludendorff Bridge, known as the so-called Bridge of Remagen, was a railway bridge over the Rhine between Remagen and Erpel. It was built for military reasons during World War I and named after General Erich Ludendorff. In the final phase of the Second World War, it represented the first Allied crossing over the Rhine. On March 17, 1945, it collapsed. She gained particular notoriety through the American war film The Bridge at Remagen in 1969.
When Army Group B under Field Marshal Walter Model retreated to the right bank of the Rhine in 1945, the Wehrmacht command wanted all the Rhine bridges to be blown up. In the case of the Ludendorff Bridge, however, less (300 kg instead of 600 kg) and less effective explosives (Donarit instead of dynamite) were used than planned. The bridge was briefly lifted from its bearings when it was blown up, but not destroyed, which subsequently enabled Allied troops to cross the Rhine at this point and accelerate their advance into the "heart of Germany". The German side tried in vain to destroy the bridge. This finally collapsed on March 17, probably due to the failed detonation and the fighting of the previous days. Hitler had several officers held responsible for the failure to destroy the building tried and shot by a court-martial.
After 1945, the Federal Railways planned to rebuild the bridge. Concrete cost plans were drawn up for this purpose. Only with the electrification of the left and right Rhine line were these plans dropped and as a result the feeder tracks in Remagen and Erpel, which had been kept free until then, were abandoned. The bridge's stream piers were eventually removed from the riverbed in the 1970s. All that remains today are the bridge towers on both sides and parts of the access ramp. Like the Erpel railway tunnel, they are under monument protection.[1][2]

Wikipedia knows:

In the final phase of the Second World War, it was the first Allied crossing over the Rhine. On March 17, 1945, she collapsed. It gained particular prominence through the 1969 US war movie The Bridge of Remagen. During the retreat of Army Group B under Field Marshal Walter Model on the right side of the Rhine in 1945, all the Rhine bridges were to be blown up according to the will of the Wehrmacht leadership. In the case of the Ludendorff Bridge, however, less (300 kg instead of 600 kg) and less effective explosive (donarite instead of dynamite) was used than planned. During the demolition, the bridge was briefly lifted from its camps, but not destroyed, which it was possible for Western Allied troops in the sequence to cross the Rhine at this point and accelerate their advance toward the Ruhr area. Wehrmacht soldiers tried in vain to destroy the bridge in the days after the conquest. This finally collapsed on March 17, probably due to the failed demolition and fighting of the previous days. Hitler had several officers, who were held responsible for the failure to destroy, sentenced by a jail and shoot.