A small but industrious mining operation that allows visitors to touch precious gems while they are still in the rock.

A park that allows you to get up close and personal with one of the world's largest open volcanic craters.

Lankaster is a research and conservation center specializing in orchids and tropical plants, located near the city of Cartago.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

A bright little alley in La Boca is a part of tango history.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

This demon atop the Notre-Dame de Paris looks utterly bored.

The remains of a convent turned military barrack in the heart of Madrid.

An ancient Egyptian temple in the middle of Madrid, Spain.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Commonly acknowledged as the only public monument to the Devil himself.

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A haven for book enthusiasts across the street from Retiro Park.

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

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

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

A historic Christian shrine nestled within a spectacular natural cave.

Giant topiary dog once played a role in a terrorist bomb plot.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.