This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Mausoleum and Holy Seat of Antiochus I of Commagene.

An abused and forgotten metropolis, abandoned for centuries.

A Turkish ghost town abandoned in a population exchange with Greece.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A wooden statue of an Estonian pagan god and King of the Setos stands atop a sacred hill.

Hundreds of unusual wheel crosses poke above the earth in this small Estonian cemetery.

Only a fragment of this 15th-century Dance of Death survives today.

A forest park outside Tallinn full of architectural and artistic curiosities.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

The gutted remains of this Estonian mansion are a monument to a tragic love.

Mysterious craters may have been home to an ancient cult.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

Burlesque Hospital Themed Restaurant.

Just another terrifying garden filled with hundreds of endlessly smiling doll people.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

These abandoned vessels are destined to be reclaimed by the forest.

Flamboyant architecture from the turn of 20th century.

A 100-plus-year-old mill transformed into a hotel and restaurant.

Once known throughout Europe, this tiny and unusually progressive 18th century micro-nation within Lithuania now lies in ruins.