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

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

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

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

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

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

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

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

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

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

When the river dries up, these stones start talking.

A church of bones, decorated with 40,000 human skeletons.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

The largest fountain in Bratislava.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

This strange statue features a bust of the famous composer plopped atop a woman's body.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.