This 1st-century CE Roman bath sits under a carpark.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

Elevated brass pavilions form a kaleidoscope of fragmented views of the surrounding historic cityscape.

Denmark’s never-ending bridge.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

Danish whalers once brought back whale bones to use as building materials in places where wood was scarce.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

At these downtown crossings, pedestrian lights show axe-wielding Vikings instead of the usual walking figures.

Iron Age "bog person" preserved for over 2,300 years.

This unique architectural wonder is home to luxury apartments.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.