Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

The remnants of the base where US Army troops learned how to fight in extreme conditions.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

When ecosystems collide in the arid Southwest.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

The highest point in Oklahoma used to be a lawless outlaw's paradise.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Spain's largest bullring offers a unique glimpse at architecture and history.

A lush indoor jungle fills this bustling Madrid transportation hub.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The first mechanized factory in Spain is also one of the most significant mints in the history of money.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

An enchanting landscape of ancient sandstone structures eroded into otherworldly shapes.

The final resting place of the great navigator, or maybe his brother.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.