Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

A scattered trail of street art adds a pop of color to the city's stark structures.

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

Mosaics created from 11 million cigar bands.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The attic of a four-century-old canal house hides a clandestine church.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Amsterdam's former hotspot for public executions and dissections.

A beautifully eclectic mix of architectural styles.

This unusual elevator doesn’t stop or slow down.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

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

What looks like a normal building is really a hollow facade hiding a subway vent.

An unusual number plate signifies the building's saucy past.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

This banal Parisian entranceway is not what it seems.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The man who is mainly remembered for a chicken dish he had nothing to do with is buried under a large concrete dome.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The modern birthplace of Irish freedom.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.