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

A lush indoor jungle fills this bustling Madrid transportation hub.

Wonderland replication in progress by one persistent man.

Bacteria and algae give the salty water its bubblegum hue.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

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

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

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

During its heyday, 72 one-ton buckets from this dredge bore into the Powder River excavating vast gold deposits.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

This 80.33 troy ounces of solid gold is believed to be the largest nugget from Oregon still in its original form.

Here, cows that make vodka are treated like celebrities.

This garden is dedicated to a Portland cartoonist who specialized in dark humor.

The unique circular corral belonging to the “Cattle King” of Oregon.

A small, fascinating fire museum hidden in plain sight in an administrative building.

A bronze replica of half-consumed salt lick honors a quirky town tradition.

The only house in Oregon designed by the famous architect, Frank Lloyd Wright.

This hotel has hardly changed in over a century, like a time capsule of old Oregon.

Stepping inside this coffee shop is a journey through time.

At the base of Steens Mountain resides an otherworldly desert.

A public fountain that spouts "health water" from a nearby spring.

A sprawling cave network created by a lone lava tube.

As a show of peace, a Japanese naval pilot gifted his 400-year-old Samurai sword to the Oregon town he bombed.