This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Climb right into the heart of this colorful Iceland volcano.

A winding, blood-red tunnel of hardened lava navigable by foot.

An encyclopedic collection of mammal penises.

This tiny museum's sizable collection is jammed into a former underground public toilet.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

Rippling sand dunes frozen in the Arizona rock.

Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A geological mystery on Camelback Mountain.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

A Nesting Doll of Churches.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.