A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

A schooner, nicknamed "The Unsinkable," with a long history of survival in the Indian Ocean.

The remains of a 19th-century school and living quarters are perched atop a mountain surrounded by a thick tropical forest.

In the middle of a busy residential neighborhood, a small roofless church being reclaimed by nature.

A grotesque collection of wax limbs depicting the symptoms of venereal disease.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

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

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

Poseidon? No one seems to know.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

An autonomous republic of Orthodox monks.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

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

You would never come across this tiny green oasis if you didn't know it existed.

A beer pipeline runs beneath Bruges.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

A church filled with the bones of hundreds of virgins martyrs—or so they say.