Seven examples where the mystery is less about why these places were abandoned - but how there were people there in the first place.

Unbelievable as it may sound, there are those who track urban wonders of all kinds - from the narrowest to the most windy streets of the world and more.

From South Korea to North Korea, Cambodia to Thailand and Japan to Azerbaijan here are seven oriental and subcontinental abandoned cities and places.

Green architecture comes in many forms though lately it seems like these forms are stranger than ever.

From seed vault to military hideouts and diamond mines to nuclear waste dumps, here are seven more underground wonders of the world.

The former Soviet Union has a complicated history that is told in part through some of its deserted infrastructure, from submarine bases to missile silos and more.

Much of America's little-remembered history can be found in largely unknown structures scattered across the United States, some of which are silently falling apart.

The European Union may appear on the surface to be a unified body but underneath each member country retains a unique and complex history.

There are amazing abandonments in America but the former Soviet Union has some of the most interesting, unique and strange abandoned buildings.

Imagine entire islands and vast building complexes eerily abandoned virtually in your own back yard. This seemingly far-fetched scenario might be more real than you realize.