Oddly shaped rock formation, misassociated with a nearby utopian community.

This ghost town was once a cult-like religious utopian settlement.

When ecosystems collide in the arid Southwest.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The atmospheric road was never meant to be so creepy.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

One of Ireland's most infamous prisons for rebels including men, women and children.

The ancient tomb acts as a calendar that keeps perfect time.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

An emerald-green grotto just a short trip from Austin.

Turning night into day in Victorian-era Austin to thwart a serial killer.

Austin’s nonprofit-run graffiti park where street art is meant to be painted over.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.