This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

Genoa's collection of over 4 million zoological, botanical, and geological specimens from around the world.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

A taste of Middle Earth, in the middle of the Bayou City.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

A medieval weapon rumored to have been used by the brilliant poet himself.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

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

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

The walls and streets of the ancient city are peppered with penises.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.