The last Viking king of Denmark is buried inside the crypt of this cathedral.

This Danish castle is supposedly haunted by a woman too independent to not be a witch.

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

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

A failed attempt to control drifting sands yielded a gnarled sylvan wonderland.

This huge industrial sculpture looks like a UFO and a factory had a baby.

Four alabaster giants contemplate the tides on the shore of Denmark.

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

The final resting place of the great navigator, or maybe his brother.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

The world's largest wooden structure.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

Hidden beneath a restaurant, underground tunnels tell the story of Malta’s tragic role in World War II.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

This unique building in the main square stands out among the city's typically Baroque architecture.

These lesser-known Maltese catacombs date back over 1,700 years.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

This church is named for one of the most dramatic tales in the early Christian church.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This subterranean necropolis holds three floors of antler-dug grave caves.

A hidden tunnel of bones in one of Malta's oldest churches.

Stone Age solar temple is aligned with the sun on each equinox and solstice.