The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

This basement museum explores the art and artistry of fascism.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

One of downtown Berlin's last reminders of its Communist past.

When German-Iraqi relations broke down, this embassy was vacated post haste.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A collection of abandoned typographic signs from Berlin and beyond.