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

A new sculpture calls attention to climate change in the centuries-old city it threatens.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

Venice's island of the dead.

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

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

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Venice's "Island of the Mad."

The middle finger of modernity.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

An alchemist's "magic door" stands in the middle of a Roman park.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This historic Chilean cemetery is the burial place of hundreds of European and American freethinkers and non-Catholics.

A museum founded to reflect on and remember the human rights abuses under Chilean dictator Augusto Pinochet.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

What was once a unique system of urban elevators is turning into a mechanical ruin.