An approximately 500 million-year-old rock outcropping covered in fossilized bacteria.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

An allegedly cursed tree represents a town's reckoning with a racist past.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

A piece of stonework relief commemorates the site where the Devil's rage, and odd apparel, destroyed a house.

Christ's blood allegedly preserved in a Belgian town.

A beer pipeline runs beneath Bruges.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

An unsettling sculpture of a boy hanging out in a street in Ghent has been baffling visitors for years.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

Fantastic views and thousands of love locks.

Inspired by the more famous Scrovegni Chapel, Cappella di San Giovanni contains several amazing frescoes.

A surreal statue honoring Prague's favorite literary son.

A series of playful yellow penguins share a serious message about the environment.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.