Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

Da Vinci's equestrian statue, 500 years in the making.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

The relics of dozens of martyrs are stored in a single chapel.

An unusual "skull with ears" sits in the crypt of this small church tucked away at the end of a narrow alley.

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

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

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

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

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

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

Pilgrimage site for star-crossed lovers.

This Italian foot path winds through the mountains via 52 individual tunnels.

Hidden treasures belonging to Mongolia's most revered and multi-talented monk spent decades buried in the Gobi desert.

This natural gas vent certainly earns its name as the smallest volcano in Italy.