Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

Historic slum of Tartu.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

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

Man-made mineral caves house massive bat colony.

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most visited, and possibly most controversial, museum in Germany.

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

An underground city of salt.

Mysterious craters may have been home to an ancient cult.

The Guardian of Tallinn.

Macabre astrological automaton clock dating to the late 1400s.