Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

The commemorative stone column conceals a secret laboratory.

Drink wine handed out through a window as part of an age-old tradition.

A statue representing a lost Roman profession that was vandalized for centuries.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The ruins of this medieval tower are destined to crumble into the sea.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

The pockmarks across the building's facade are remnants of the Blitz.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

This ancient Roman arch misled treasure hunters for centuries.

An ornate private entrance to the Vienna subway built specifically for the emperor.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The oldest Hindu temple complex in Nepal serves as the seat of Nepal’s national deity, Lord Pashupatinath.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

These docile dragons are ideal inhabitants for the conservatory greenhouses.

Three small rooms in the jungle house the most elaborate and intact murals of the Mayan world.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.