In the days before house numbers, these colorful signs held clues about various buildings' purposes.

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

Krakow's own version of the Hollywood Walk of Fame.

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

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.

This grubby wall is said to be one of the Earth's esoteric energy centers.

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

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

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.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

Prague's "Little Hanoi" is one of the commercial centers of Czechia's Vietnamese community.

The ruins of a medieval bridge are visible inside a Prague Metro station.

Spitfire airplanes with butterfly wings hover over Prague’s skyline.

A beautiful window with the old Tesla Radio company logo.

Tiny communists hammer away on the Olomouc Astronomical Clock.

A cheeky reminder about the value of art dangles above one of Olomouc's busiest streets.

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

Large metal sculptures spread throughout an open landscape.

At this local mall, visitors are ushered through a 1940s jail exhibit.

A blast from the past in central San Diego.

A hidden courtyard houses early 20th-century plaster masterpieces.