This unattributed sculpture in Amsterdam is hiding in plain sight.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A curious collection dedicated to human and animal anatomy and pathology.

A floating cat sanctuary on an Amsterdam canal.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

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

One of the most photographed locations in the entire city.

Dedicated to the god Dionysus, this theatre was used for both musical and theatrical performances.

This pink watchtower served as the seat of the Greek government after independence from the Turks.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

Built by the Ancient Greeks, this chariot bridge is still in use today.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

This smily stone feline is meant to represent a mythical lion that almost destroyed the island of Kea.

A magical, if a bit tacky, 1960s castle conjures up medieval fairytales and Greek mythology.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

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