An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

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

The Guardian of Tallinn.

"There's nothing there," and other lies the KGB told us.

A black cat protests the City Guild in Riga's Old Town.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

The oldest continuously operating pharmacy in Europe.

This statue is dedicated to the animal cosmonauts that perished during space flight experiments.

A historic scientific breakthrough that crosses nine borders.

The secret cells in the basement of the KGB's Estonian "Grey House" have been preserved as a grim Cold War museum.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

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

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.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

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.

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

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

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

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