Mine your own precious stones.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A unique solar-powered pottery studio and gallery in the desert.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

This multi-level, aqueduct-footbridge hybrid is one of the greatest works of the Spanish Renaissance.

These magnificently sculpted tombs represent Spain's own legendary version of "Romeo and Juliet."

This semi-secret storybook hedge maze is also the oldest garden in the city.

A stately palace has been converted into the world's largest cannabis museum.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The site of the Wellington avalanche, one of the America's worst railroad disasters.

A tribute to the Nirvana frontman hides beneath the bridge that was the singer's beloved hangout spot.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Despite his legacy of work in Spain, Cuba, and Florida, the larger-than-life writer's grave is a simple affair tucked in an Idaho cemetery.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A volcanic fissure over two miles long and up to 70 feet deep.

A massive sea stack famous for its appearance in The Goonies.

The highest point in Washington state is a volcano covered in glaciers.

A bike being "eaten" by a tree is the real Vashon legend behind popular children's book, "Red Ranger Came Calling."