Mysterious and ancient carved standing stones.

A replica of a beloved, delicately-balanced granite boulder.

This giant power line tower is a robot that can express its moods in neon.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

A father built this one-of-a-kind house in the shape of his son's race car.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

An ancient octagonal weather station named for the eight Greek gods of wind.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

An abandoned Byzantine fortress and notorious prison.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

Honor one of Argentina's most prolific writers at his historic home.

A grotto replicating one of the world's most famed Marian apparitions sits across the ocean from the original.

A pocket of Buenos Aires with an unusually high concentration of psychotherapists.

The house of a former Argentinian president stands protected within a large glass case.

An intriguing antique iron Ferris wheel that most locals are sure was designed by Gustave Eiffel.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.

The narrowest house in Buenos Aires is less than 10 feet wide.

Bible stories are brought to life with gloriously cartoonish kitsch in this South American theme park.