An abandoned saucer-shaped monument in the Bulgarian mountains.

A striking symbol of the Bulgarian capital.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

Third time's a charm, or in this case, two testicles are.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

A Milanese café entirely designed by the American director Wes Anderson.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

An impressive bridge over a ravine also served as an aqueduct.

Thousands of well-dressed mummies below a monastery.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This Communist-era residential block is one of the longest residential building in Europe.

The site of the first battle of World War II.

The church's remarkable frescoes incorporate Finnish artist Hugh Simberg's trademark themes of death and the supernatural.

A 19th-century pharmacy converted into a bookstore.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Real bones which are said to have belonged to a Polish dragon.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.