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

This modernist tower was saved by a fraternity with a 500-year-old penchant for shooting at wooden parrots.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Old Danish castle immortalized in Shakespeare's Hamlet.

Nordic giants resurrected from the sea and restored to their former greatness.

This sublime architectural marvel is a rare example of an expressionist church.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

Copenhagen's celebrated theme park and gardens.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Mile-long cave system near Great Smoky Mountains.

The secret city built by the Manhattan Project.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

Enormous lake at the bottom of a unique cave system.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

This two-room shotgun shack in Tupelo is the birthplace of a King.