Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

Geothermal waterfalls in Tuscany.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A submerged archeological park still holds the wonders of a Roman Sodom.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

An islet filled with wooden houses where the open sea meets a lagoon.

An artistic melting pot inside an old roadside inn from the Ottoman era.

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

This quaint farm in the Peloponnese countryside hides an astonishing cache of antique curiosities.

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

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.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

The abandoned summer estate of the former Greek Royal Family.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

An abandoned Byzantine fortress and notorious prison.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

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

An autonomous republic of Orthodox monks.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.