This Ottoman-era church is hidden amid a busy tourist area.

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

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

This building displays the scars of the “Dekemvriana,” a dark time in modern Greek history.

The home of Greece’s national poet sits crumbling in the middle of a popular tourist district.

The largest flower auction house in the world.

The location of the world's first telescope demonstration.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

The Adriatic's most famous wind can be reliably experienced in the city's Marina.

This war memorial holds the remains of around 20,000 World War I soldiers from both sides of the conflict.

This graffitied 19th-century building was a prototype of European industrial architecture.

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The best place in the world to buy tinned fish.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

A steam powered train that runs on city streets.

The ancient latrines of the Greeks, in all their public glory.

A charming beach town in Turkey captures all the colors of the rainbow.

This giant wire frame man sculpture is crouched in contemplation.

Building Men of War and Indiamen from Holland's Golden Age.