This 18th-century former mosque held the first Hellenic Parliament.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

This Ottoman-era Greek Orthodox Church was built to honor Agia Pareskevi, a Christian saint.

This abandoned shopping arcade has new life as an art installation.

Where commuters walk through remnants of an ancient Greek necropolis.

The ruined doorway is a portal to the building's turbulent and torturous past.

Only open for two days a year, this church links ancient Greek and modern Christian celebrations.

A series of waterfalls create the illusion of perpetual rainfall in this hidden gorge.

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

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

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

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

This church combines Christian, Byzantine, and ancient Greek architectural elements.

A closer look at this somewhat faded hotel by the Corinth Canal reveals the architectural undertones of a genius.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

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

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

One of the oldest masonic museums in Paris.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.