A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A collection of objects supposedly singed by the hands of souls in purgatory.

Where once there was a train station bathroom, there is now this German burger joint.

A slice of central Asia in the middle of Berlin.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

An old tram depot transformed into a vintage car paradise.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

A treasure trove of rare and exquisitely detailed antiques

An oddities shop that dabbles in the deathly and beautiful.

An art museum inside an active factory.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

This once-abandoned mansion is now a dreamy event space.

Mexico City's residents are being watched by this state surveillance headquarters, designed by architects with a flair for intimidation.

66,000 pieces of art, donated by one of the world's richest men.