Terrifying derelict military hospital once housed a recuperating Hitler.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Come stay at a live-in art installation.

A decommissioned submarine base makes a great space for graffiti art.

3,000 market stands in five former Zeppelin hangars.

A former imperial sea-fortress and Soviet prison.

A black cat protests the City Guild in Riga's Old Town.

Guests become prisoners on a visit to Latvian prison.