This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Plot your trip through the city on the sidewalk.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

An enormous, inside-out glass globe built in 1935.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Legendary site where an evil bishop was devoured by rodents.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

A gender-bending antihero's grave, where lies the inspiration for both book and film.

The highest point in Belgium is a staircase to nowhere.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

A giant bug impaled on a 75-foot-tall needle.

When you're a great Russian Tsar, even your vomit gets a statue.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

Christ's blood preserved in a Belgian town.

Theme park featuring miniature replicas of European monuments.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Cozy basement bar sports an inventory of over 2,000 beers.