The narrowest street in Paris.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

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

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Once the home of a hermetic monk, this cave now houses a small church.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A beloved street vendor is memorialized outside a German train station.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

The bears of Bern have been a city highlight for over 500 years.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Mysterious chains and iron stakes adorn this strange grave, with no explanation.

Epicurean and holy traditions converge in what may be the oldest restaurant in Europe.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

One of England's most famous churches hides a pair of little known architectural treasures.