This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

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

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

A diverse collection of wax, bone, papier-maché and mummified relics.

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.

Where Venice's gondolas go for a tune-up.

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

The oldest botanical garden in the world that technically isn't the oldest.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

100 year tradition of fist fights, marked by marble footsteps.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Pilgrimage site for star-crossed lovers.

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

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The middle finger of modernity.

Inmates dig the graves at the largest prison cemetery in the U.S., the final resting place of both cowboys and Indians.

The world's tallest statue of an American hero.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

The man who wasn't there.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Belly up to the bar in Cowtown, don't forget to buy some boots.

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.