A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

66,000 pieces of art, donated by one of the world's richest men.

The only castle in North America to ever house European sovereigns.

Part bookstore, part café, and part forest.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Mexico's astounding mummy museum with "the world's smallest mummy."

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

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

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Italian cave with exceptional acoustics and an unsavory history.

142 ceramic steps become a mosaic once a year.

The bomb-ravaged remains of of a colossal Neptune.

Five candy-colored villages on the Italian Riviera.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Fortified medieval tower house with lovely roof garden.

The naturally mummified body of a peasant girl saint.

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

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

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