The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

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

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 legendary city has been a tourist attraction for centuries.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

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

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

Monasteries on rock pillars, once accessible only by frayed ropes.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

This historic black and white monastery is one of Bulgaria's architectural jewels.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

An homage to the medieval rulers of Bulgaria.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

A spooky spot along the road where things mysteriously seem to move uphill by themselves.

A medieval church built up to defend its village.