This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

An encyclopedic collection of mammal penises.

This elegant arc of a waterfall marks a religious turning point.

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

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Staves, storm-calling, and of course, necropants.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

A hugely vast Irish landscape of barren rock that stretches for miles.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

One woman's Viking Castle on Lake Tahoe.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

Back in the day everyone who was anyone played this historic western theater.

These once-beautiful historic graveyards are set against the barren Virginia City hills.

Historic home to one of the most famous women pioneers of the 19th century.