When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

Longest fortress system anywhere in Europe.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

Humble beginnings for one of the world's most famous scientists.

Legend has it fairies gathered at the site of this medieval castle.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A musical instrument played by the sea.

An ethereal glowing blue ocean cave in Croatia.

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

Iceland's only steampunk shop imagines a retro-futuristic world that never was.

A vintage video game wonderland in downtown Reykjavik.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

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

This tiny cabin was home to one of Iceland's most famous painters and was the only land he ever owned.

A world-class theater sits hidden in this remote town in West Iceland.

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

Iceland's tribute to its thankless civil servants.

Inside this museum, visitors venture through ghost stories entrenched in Icelandic folklore.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.