This medieval city gate is now a blend of the past and the modern world.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

An artistic melting pot inside an old roadside inn from the Ottoman era.

The celebrated eyesore created by starry-eyed sweethearts.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A hospital where antique dolls are given new life.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

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.

A 300-kilogram egg sculpture that embodied a neighborhood revival.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.