Luxembourg is easily reached from major European cities on cheap flights to LUX, HHN, and SCN, by train on discounted tickets from London, Paris, and Brussels, or by car.
The Luxembourg American Cemetery and Memorial in Hamm has the graves of General George Patton and US military personnel who died during the Battle of the Bulge in WWII.
The fortifications and casemates of Luxembourg were inscribed on the UNESCO World Cultural Heritage List as an outstanding example of European military architecture.