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

This green and white building is shaped like a massive Rubik's Cube.

The oldest operating picture gardens in the world.

Home to the last shore-based whaling station in Australia.

A sculpture serving as an homage to Pope John Paul II.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

This building features dozens of faces along its facade, although one is a bit chilling.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

Stuck in the arcade of Casa Isolani are three arrows of mysterious origins.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

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

A masterpiece of modern architecture that caused quite a stir in Paris, recreated in Bologna half a century later.

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

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.