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

Legend says this sacred tree was a gift from goddess Athena.

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

This striking sculpture of Icarus honors Greece's fallen flyers.

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

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

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

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

The remains of 50,000 World War I soldiers rest under a towering arch overlooking the Alpine battlefields.

All that is left of this medieval castle is two towers, both of which now display a visible tilt.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A haunting collection of sunken wooden barges litters this Italian river bend.

Now home to a drinking establishment, this building has a macabre history.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Destroyed numerous times, this centuries-old bridge has always been rebuilt with its original design.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

One of the largest squares in Europe contains an entire artificial island.