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

A small granite monument marks where the borders of three countries meet.

This antique thermometer honors the creator of the first universal temperature scale.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

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

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The site of the first battle of World War II.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

The only international border marker within the United States.

The 40-foot-tall votive candle is the largest of its kind.

A small "palace" and museum made of, and devoted entirely, to salt.

A Texas museum filled with Broncos and Betties.

A medieval castle in the middle of rural Texas.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Gods clash with machines in a power plant regenerated as a museum.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.