According to legend, this ancient column contains healing properties.

Step inside an ancient beehive tomb built for a mysterious cult hero.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

Temple complex that once housed the famous statue of Nike.

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

Where commuters walk through remnants of an ancient Greek necropolis.

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

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

Giant marble phalluses on the sacred island of antiquity.

The hallucinogenic center of the ancient world.

This legendary city has been a tourist attraction for centuries.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

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

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

A surrealist timepiece by the artist of melting clocks.

A mechanized clock where a man fights off a dragon, crab, and rooster.

France's national museum of scientific and industrial instruments.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

The Sun King's military models, saved from the Louvre.

This bridge was constructed from the rubble of the infamous Bastille.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.