Luxembourg's diminutive capital is a delicious contrasting mix of the old and the new. Spend some time exploring the old city with its cobbled streets and imposing walls, and feast your eyes on ornate windows or jewel-like medallions. Come back to modern day as you pass contemporary constructions of glass and steel that house the many banking and business establishments in the capital. Take a lovely walk through Useldange where you can't miss the feudal castle surrounded by rolling plain.