Nature

Visit the site of a subway powered by nothing more than air--and lots of it.

Community owned and operated, this property is home to a diverse set of nudists.

This lava formation earned its whimsical name from the log-like formation of it stones.

A unique beach made of a myriad of multi-sized pebbles.

Russian researchers who have been excavating ancient squirrel burrows may have brought a 32,000-year-old plant back to life.

A massive sustainable farm designed by the mastermind behind Central Park.

The true jewel of Africa's west coast known as "Africa's Last Eden."

The longest continuous lava tube in Oregon.

One of the deepest blue holes in the world.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

A salt lake dotted with steaming limestone chimneys.

Handcrafted thermal spa washes away each night with the tide.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

Massive volcano in the Andes is the farthest point from earth's center.

An ancient cemetery with some historic bodies underfoot.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

The home of aviation trailblazers, in a remote corner of the big city.

A historic coal mine that doubles as a museum and tourist attraction.