These medieval skyscrapers dominate the skyline of this small Tuscan town.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The celebrated eyesore created by starry-eyed sweethearts.

This 18th-century sundial was designed to calculate the date of Easter each year.

The video game-themed street art first popped up in the French city.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Paris' linguistic guide to the international language of, yes, love.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The seamy, underground secrets of Portland's criminal past.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

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