The traveller to the D-Day beaches in Normandy will come across several museums with memorabilia on the landings. The museum in Arromanches is one of the best.
The beach at Arromanches was where the British set up their artificial harbor by floating huge blocks of concrete from southern Britain to this location and sinking them. The remnants of these blocks are still visible from shore. The museum has a fascinating display and movie on the planning and creation of this artificial harbor.
This historical site has a great web site with much more information on this museum. You can find it at : http://www.normandy1944.com