A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

A magical place that lets you play in and explore the world of Studio Ghibli.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

This Stockholm light tower can be controlled by anyone with a smartphone.

It houses the remains of a 17th-century version of the Titanic.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

A giant red chair bolted to a rock on a remote mossy hillside in Iceland.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

A winding, blood-red tunnel of hardened lava navigable by foot.

An encyclopedic collection of mammal penises.

It is said a heartbroken man visited the gap every day to stare blankly out at the sea.

Every year locals give the bear a fresh coat of paint to preserve its signature goofy grin.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

An old Danish political institution where members of government can grab a drink off the record.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

Hans Christian Andersen for the postmodern world.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

An isolated, rusty phone booth commemorates Iceland's first international telegraph cable.

This modern monument to pagan belief looks like it was transported straight from ancient times.