The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

The bomb-ravaged remains of of a colossal Neptune.

Drink wine handed out through a window as part of an age-old tradition.

Beer lovers thirsty for knowledge can now visit a museum devoted to the world's largest hop-growing region.

Behold, a collection dedicated to Germany's favorite vegetable.

This small town in Germany was once a center of peppermint production, and has the museum to prove it.

Four-story slides send people whizzing through the math department at this Munich university.

The prototype for all Nazi concentration camps.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

A completely underwater art museum sends a stark message about humans' impact on the environment.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Hundreds of caves once used to store grains and animal feed.

The narrowest street in the world is in danger of closing up entirely.

This sidewalk tribute honors Colorado's great culinary creation.

A museum of carnival attractions where you are invited to ride the rides.

Got apples?

The tomb of history's greatest potato promoter is surrounded by tubers.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

Berlin's old airport.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".