What happens here stays here – unless it affects the whole world.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

This small, hidden cove is home to abandoned boats.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Once America's longest-manned military fort, now an abandoned hulk.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Read a book next to a Midtown waterfall.

Sniff the Titan Arum's rotting flesh.

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

This TV tower once secretly housed a GDR intelligence team.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A restaurant and observation deck built in a unique broadcasting antenna.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

This conical hill was built as a testing ground for an engineer known as the Glider King.

Berlin's old airport.

Super-heavy Nazi architectural experiment.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.