Massive crater in central Oregon.

The longest continuous lava tube in Oregon.

A volcanic landmark located on an Ice age lake bed.

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

This frequently-photographed waterfall takes only a short hike to visit.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

In the midst of a residential town in Washington exists a property saturated with one man's artistic creations.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This bridge provides safe passage for squirrels.

One of the world's tallest, oldest, and most disgusting chocolate cascades.

An institution that preserves the history of institutionalization.

Home to the only outdoor municipal elevator in the United States.

Glasgow’s piece of the patron saint of love.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

A 200-year-old collection of oddities and medical paraphernalia.

Early Medieval stones sit on display at the beautiful Govan Old Church in Glasgow.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

The sign at the garden gate reads: "These Plants Can Kill."

The heads of two giant mythological water horses honor Scotland's horselord past.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

The mystery of this small, brick pond eluded its possibly only investigator until his death.