Jesus' footprints and the first catacombs in the world.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

A sharp sculpture made of thousands of pieces of jagged glass.

Sofia's legislative center is continuously reinventing itself.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

The ruins of an early-18th-century complex that could once house up to 12,000 horses.

The legacy of a Moroccan Jewish community is remembered at this little mouldering cemetery.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Op-art architecture designed for happiness.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.

A miraculous three-handed portrait of a saint can be found inside this church.

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.