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

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

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

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

The sacristy of this church contains remains and relics of members of the Aragonese royal family.

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

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

A massive stone fox oversees a Rotterdam elementary school crosswalk.

An icon of International Style architecture on the outskirts of Rotterdam.

Roman ruins, natural methane fires and a lovely beach.

Flames have been burning within this mountain for more than 2,500 years.

A Turkish ghost town abandoned in a population exchange with Greece.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Ottoman-era houses lovingly preserved.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.

This mysterious cliffside carving of an ancient Hittite deity has baffled scholars for centuries.

A museum of carnival attractions where you are invited to ride the rides.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Journey through the ruins of this ancient Roman temple dedicated to the god of war.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

This unusual piece of Renaissance art depicting the bodily horror of crucifixion and skin disease may have been inspired by fungus-induced hallucinations.

A place to see how French aristocrats lived in the early 1900s.

This prehistoric figurine is the oldest known realistic depiction of a human face.