A striking public sculpture representing the period of martial law in Communist Poland.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

Super-heavy Nazi architectural experiment.

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.

Brussels' favorite peeing boy has a sister.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A little sculpture with a large wardrobe.

Climb inside an iron crystal magnified 165 billion times its normal size.

Twisted buildings adorn the banks of the Rhine river.

Sniff the Titan Arum's rotting flesh.

Ride the subways of yesteryear.

One of only two commuter aerial tramways in the United States.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

This Singaporean food-court stall was home to the world's cheapest Michelin-starred meal.

Singapore's landscaping project is home to 18 incredible Supertrees.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Cold war icon and onetime "hole" in the iron curtain.

A 12th-century fortress containing some of Berlin's oldest buildings.

Berlin's old airport.

A fascinating insight into daily life in the Eastern Bloc.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An eerie, derelict amusement park in Berlin.