The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

A modest reminder of treacherous waters at the Golden Gate.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Canyon walls shrouded in ferns.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

Climb inside an iron crystal magnified 165 billion times its normal size.

The most visited, and possibly most controversial, museum in Germany.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The rocks in this arid basin leave trails of movement behind them.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

A winding path built in secret on the edge of the continent.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A 300-ship graveyard, with a few still visible at low tide.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

A huge musical instrument played by the ocean.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.