A mega theme park-wax museum mélange containing all things biblical.

The most unusual block in Brasília.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

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

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

This curious, round temple is the oldest still-standing marble building in Rome.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

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

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

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

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

A fairy tale castle in modern Rome.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

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

A sculpture serving as an homage to Pope John Paul II.

The mystic whose incorrupt corpse still attracts the faithful.