A century-old network of freight tunnels underneath the city's historic business district.

A hollow cement depiction of time's inexorable effect on the human body.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

An enormous park-like oasis, full of famous Chicagoans' graves.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A lush green oasis in the middle of Chicago.

A monument to the art of slicing people open.

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

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

The only museum with its curator—and her pets—buried inside.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Fortified medieval tower house with lovely roof garden.

A lover's walk between hilltop towns, decorated with graffiti love notes.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

The yawning maw of this pagan visage is said to bite off the hands of liars.

Geothermal waterfalls in Tuscany.

This community on a small Venetian island has taken to painting their houses in bright neon hues.