Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

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.

This psychedelic tourist trap is a leisurely descent into madness.

An collection of Chinese propaganda posters from 1949 to 1979.

The once highest point in China blends symbolic design with a kick of adrenaline.

An out-of-place slice of France, smack in the middle of Shanghai.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Numerical symbolism abound at East Asia's oldest observatory.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Berlin's old airport.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Started as a kitchen garden, now the second largest botanical garden in the world.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Hamburgers are intensely proud of their tunnel beneath the river.

Model Trains and Much More in Hamburg.