The final resting place of the poets Shelley and Keats.

The mummified relic of St. Catherine sits forever on a golden throne.

A fairy tale castle in modern Rome.

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

A sunken idol welcomes parishioners to Davy Jones' Locker.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Italian cave with exceptional acoustics and an unsavory history.

The Emperor Tiberius' palace of debauchery.

Architectural monsters are devouring this palace's every door and window.

Host to the annual Festival of the Snakes.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Some people believe that this makeshift space monitoring station received transmissions from clandestine cosmonauts.

This Italian ski resort rose to fame when Benito Mussolini was held prisoner there and then rescued by the SS.

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

Something's missing between the arcades of the Palazzo della Ragione in "the city of the three withouts."

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

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

A huge enchanting public park just outside the ancient walls of Rome.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

The 1940s structure houses what was once Europe's largest telescope.

A monk spent 14 years carving steps through tuff to make this religious site more accessible to pilgrims.