Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.