At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

The last king of Poland was interred in this church nearly 200 years after his death.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

This hidden collection of everyday objects illustrates life within communist Poland.

This unique architectural wonder is home to luxury apartments.

The final home of the legendary Danish sailor said to have lived to be 146 years old.

This inverted metropolis model is the artist's "revenge" for not being allowed to have a doll house as a kid.

A public display of random paleontology.

A symbol for the opposition to nuclear power around the world.

A medieval church built up to defend its village.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

You'll find the little birds tucked within the rocks of this Australian beach.

Let these towering termite-building structures tell you where to go.

Site of the largest volcanic eruption in the last 25 million years, one which may have nearly wiped out humanity altogether.

No matter how many times this community-run sauna gets destroyed, it always rises from the ashes.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This church also serves as a lighthouse complete with a beacon.