An unnatural lake in a naturally beautiful setting.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

A modern zoetrope on the New York City subway.

Spiral-bound community recipes and antiquarian gems mingle at this small East Village shop.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

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

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

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

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

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

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

This sixth-century church housed an icon with eyes so beautiful legend has it they inspired the name of a Greek city.

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.

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

Get hands on with the technological marvels of the Classical world.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.