A huge musical instrument played by the ocean.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A 140-year-old castle with underground caves hidden in San Francisco.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

Its buzzing collection honors vibrator history.

Olfactory delights in San Francisco's Botanical Gardens.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The only theatre in the world constructed specifically for sound movement.

A museum befitting the city responsible for supplying the majority of the world's LSD.

Another entry into the world of Edinburgh's pop-up artworks.

Built to hold the worst of the worst of the Nazi war prisoners.

Even after the church tried to wipe the practice out, this pagan festival lives on each year in a small Scottish village.

Legend says this cave housed a 16th-century cannibal and his family of 48.

Protecting the dead from opportunistic body snatchers.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

The middle finger of modernity.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Natural history museum displaying a famous taxidermied St. Bernard.

The world's only silo that was topped by two revolving restaurants has unfortunately been demolished.

Along this wire fence, travelers have been leaving a particular memento since 2012.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.