These "anatomical machines" are only one of the many strange items in this Italian crypt.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

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

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.

These ancient artifacts are a testament to the enduring significance of the bull in Spanish culture.

This small museum tucked within a subway station holds pieces from Madrid's past.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Jesus' footprints and the first catacombs in the world.

The final resting place of the poets Shelley and Keats.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

Historic medieval fortified city in southwest France.

This famed marionette theater and museum is bursting with imaginative string puppets.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Go surfing on this urban wave, "hacked" by local surfers.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.