These ruined Incan mausoleum towers still bear carvings of sacred animals on their blocks.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

A series of tiny artificial islands rich with produce bob atop the surface of the lake.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

One of the best beaches in the entire world.

1% of Greenland's entire population used to live in this single building, which is now slated for demolition.

In the northernmost city in the world, it's illegal to be buried because it’s too cold for bodies to decompose.

This Arctic storage facility is a secure backup for agricultural biodiversity.

This Arctic mining town is home to a cat that's spent years masquerading as a fox.

This bright green structure is the final resting place of the 16th-century leader responsible for building the walls around Harar.

A powerful tribute to the victims who suffered under Ethiopia's most devastating regime.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

Ethiopian standing stones featuring remarkably preserved carvings of swords and people.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.